My name is Gianluca Ferretti, and for 29 years I believed death was the simplest fact in the world. A heart stopped. Blood cooled. Cells collapsed. A body became matter, and matter obeyed measurable laws.
That certainty was not arrogance at first. It was training. My father had been an embalmer, and his father before him. I grew up around formaldehyde, white light, stainless steel, and the quiet discipline of men who never raised their voices near grief.
By 1997, after graduating from the Institute of Forensic Sciences in Milan with the highest mark, I had learned to trust only method. I prepared bodies for viewing, stopped visible decay, restored features, and gave families one last recognizable face.
My wife Claudia called me stone. She did not mean it cruelly. We had two children, Marco and Sofia, and I could come home from work, wash my hands twice, sit at dinner, and speak calmly about schoolwork.
On Sunday, October 13, 2006, at 5:45 p.m., the director of my funeral company called our apartment on Via Bergamo in Monza. Marco and I were watching football, with exactly 12 minutes left in the match.
The assignment was urgent. Hospital San Gerardo had a 15-year-old male patient whose parents wanted him prepared for Wednesday. I wrote the name on the pad beside the phone: Carlo Acutis. It meant nothing to me.
The next morning, October 14, I arrived at the hospital at 8:30. Heraldo, the technician on duty, gave me the clinical file: acute promyelocytic leukemia type M3, diagnosed October 3. Death recorded October 12 at 6:22 a.m.
Nine days had passed between diagnosis and death. Forty-eight hours had passed since the body entered refrigeration. The panel outside the cold room read 4°C, exactly where it should have been.
Carlo was thin, dark-haired, and dressed in a pale blue hospital gown. His arms lay beside him in the still geometry of death. I moved him with Heraldo and brought him into my preparation room.
The room smelled of disinfectant, latex, alcohol, and cold metal. Fluorescent lights hummed above the steel table. My cavity aspirator, infusion pump, restoration kit, and contact thermometer were already placed in their proper order.
I began the initial assessment, as I had done thousands of times before. When I pressed the thermometer against Carlo’s forehead, the display read 35.6°C. I stopped moving.
A body refrigerated for 48 hours should not read like that. I cleaned the sensor with isopropyl alcohol, waited two minutes, and measured again. The new reading was 35.4°C, still impossible.
At first I chose the explanation a technician chooses when reality becomes inconvenient: equipment error. I checked the device against my own wrist. It read correctly. Then I checked his sternum.
The display rose to 35.9°C. Four minutes later, it showed 36.1°C. A dead body without circulation cannot generate or regulate heat. That is not opinion. That is physics.
I called Pietro, my 24-year-old assistant. He was still young enough to look frightened around children and teenagers. I asked him to check Carlo’s cervical mobility without telling him what I had measured.
He moved the neck gently right, then left. His hands paused. ‘Maestro, this is not right,’ he said. There was no rigor mortis, no stiffness, no normal resolution pattern. It felt like sleep.
Then I called Dr. Maurizio Allegri, forensic physician at Hospital San Gerardo. He was 62, white-haired, harsh-voiced, and skeptical enough to make me seem sentimental. He arrived in 20 minutes with his own thermometer.
His instrument was a German Testo 626. Mine was a Hanna Instruments HI935. Two different devices, two different operators, two different sensor systems. He measured forehead, chest, abdomen, and left foot.
His numbers were 35.8, 36.0, 35.7, and 34.9°C. He wrote them carefully in his notebook, then stood without speaking. I had known him for years and had never seen silence beat him.
I placed my thermometer over the heart point, not the sternum but the apex area where a doctor would put a stethoscope. The screen read 37.1°C. That was living temperature.
The numbers were the only language I trusted. That morning, they began speaking against me, calmly and with precision, until every certainty I had built my life on sounded childish.
Pietro stood in the corner with his arms folded tight. Allegri removed one glove and then stopped, as if even that small action required permission. The fluorescent lights hummed. The steel tray reflected our faces in broken white strips.
Nobody moved.
Then Carlo made a sound. I know the noises a body can make after death. Gas can shift. Air can leave the lungs. Tissue can settle. This was not that.
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It lasted less than two seconds. It was not a word, and yet I understood it in a place deeper than hearing. I had to know who this boy was before I touched him again.
I left Pietro with strict instructions to record the room temperature every 15 minutes and not to change anything. Then I went upstairs to find Father Marco Belini, chaplain at Hospital San Gerardo.
I found him in the second-floor chapel arranging prayer books on a wooden shelf. When I asked about Carlo Acutis, his expression changed before he said a word. He had been with Carlo during the last three days.
He told me Carlo had been in terrible pain but had not complained. He spoke of heaven, the priest said, as if it were not an idea but a destination he had already seen on a map.
On October 11, Carlo told him, ‘When I get to heaven, I will keep doing what I have always done. I will keep documenting the signs. I will leave them where people who need them can find them.’
Father Belini explained that Carlo had documented 164 Eucharistic miracles from Church history. A website. A traveling exhibition. Evidence gathered by a 15-year-old boy who believed God could be traced through matter.
When I returned to the preparation room, Pietro handed me the temperature sheet. At 11:00, 36.9. At 11:15, 37.0. At 11:30, 36.8. At 11:45, 37.2.
The body was not cooling. It was fluctuating around 37°C, as if some invisible system still regulated it. We kept measuring every 30 minutes, using two thermometers and two operators.
At 12:00, 37.1. At 12:30, 36.9. At 1:00, 37.0. At 1:30, 37.2. At 2:00, 36.8. At 2:30, 37.1.
Allegri took superficial tissue samples for rapid microbiological analysis. A body 60 hours postmortem should show bacterial activity, cellular membrane degradation, cadaverine, and putrescine. Instead, the results looked like early hours after death.
Cellular integrity resembled a body no more than four hours postmortem. ATP markers remained detectable. Lactic acid was within normal limits. Cadaverine and putrescine were absent. Allegri read the page three times.
Then Pietro found the green notebook in Carlo’s belongings bag. Inside the transparent hospital bag were a shirt, socks, a blue rosary, and the soft-cover A5 notebook with tight, uneven handwriting.
The first page was dated October 9, 2006. Carlo had written that he knew he would die soon and was not afraid. He wrote that what he could not explain with words, he would explain another way.
He wrote that the person preparing him for the funeral would find something with no scientific explanation. They would not understand it then, but they would afterward. When they understood, he hoped they would lose fear.
Not fear of death, he wrote. Fear that there is nothing after.
At 8 p.m., after 11 hours in the room, I called his mother, Antonia Salzano. I should not have called. A thanatopractor does not intrude into a mother’s grief. But the notebook demanded direction.
I told her we had found something. She said, calmly, ‘You found the heat.’ I could not speak for a moment. She explained that Carlo had told her three days before death.
He said the person preparing him would feel his heat, and the heat was not for Carlo. It was for that person. The message was simple: death was not a wall. It was a door.
The next day, October 15, Carlo’s temperature finally began to drop, though it remained abnormally high for 72 hours postmortem. On October 16, I dressed him in jeans, a sweatshirt, and Nike sneakers at his family’s request.
On October 17, he was viewed at Santa Maria Segreta in Milan. I attended in plain clothes, standing at the back. I watched people touch the coffin glass and withdraw their hands with startled faces.
On October 20, Carlo was buried in Assisi. I returned to my ordinary work. The next four bodies behaved exactly as bodies do: cold, rigid, changing according to known process. That contrast was brutal.
Three weeks later, the envelope arrived at my company. There was no return address, only my name written by hand. Inside was one sheet in the same handwriting as the green notebook.
It was the thirteenth page, the one I had never photographed. Someone had torn it out before the notebook reached the hospital belongings bag. At the top, Carlo had written: For Gianluca.
The page said the hands that prepared him would tremble. It said trembling was the correct response when a person meets something larger than what he knows. Then came the sentence that broke me.
‘Keep measuring. The numbers are your language, and the numbers will tell you what words cannot.’
Carlo had written my name before I entered the hospital, before his family knew my assignment, before any human schedule connected us. I called Father Belini that night and asked if Carlo had ever mentioned me.
The priest was silent, then said Carlo had told him on October 10 that the man preparing him was named Gianluca. He had said to tell me to keep measuring.
For two years, I told almost no one. Allegri and Pietro knew. Pietro left the profession in 2008. Allegri died in 2016 after a heart attack. Before he died, he left me a folded note.
Inside was one line: 37.1. I never found the explanation. Now I am going to look for it directly.
I kept that note with Carlo’s page in a plastic sleeve, locked in a drawer in my home in Monza. They remain the only documents in my life I cannot classify.
In 2020, when Pope Francis beatified Carlo Acutis on October 10, I watched the ceremony on television with Claudia. She had known something changed in me after October 2006, but I had never told her.
That day, I told her everything. It took two hours. She did not interrupt once. When I finished, she asked why I had hidden it. I said I did not know how to say it without sounding insane.
She took my hand and said it was warm. I thought about that for a long time. My hands had stopped feeling like stone on October 14, 2006.
In 2021, I contacted the postulatory connected with the cause of canonization. In Rome, at the dicastery, I handed over copies of my notes, the measurements, photographs of the notebook, and the page bearing my name.
In September 2022, I testified before a Vatican commission for three hours. Doctors, theologians, and a physicist trained in thermodynamics questioned my protocol. I could not control belief. I could only give them the truth.
On September 7, 2025, Carlo Acutis was canonized by Pope Leo XIV. I stood in Saint Peter’s Square, attending a religious ceremony that was not a funeral for the first time in my life.
When the words of canonization were spoken, I felt the same warmth in my hands that I had felt in the preparation room in Monza. Not emotion. Not theater. Temperature.
My son Marco is now 30 and a doctor at San Raffaele Hospital in Milan. He inherited my need for proof. When he asked what I had learned, I answered as plainly as I could.
The numbers did not lie. The body read 37.1°C at the heart. Two thermometers confirmed it. Tissue markers resisted decomposition. A notebook named what would happen before it happened.
That is what I know. And what I know is enough.
I still prepare bodies. Carlo did not tell me to leave my work. He told me to keep measuring. Now, when I touch the last warmth in someone who has just gone, I understand it differently.
Heat does not prove everything. But in that room, it proved enough to change every cold certainty I had inherited from my father and grandfather.
Carlo Acutis once said the Eucharist was his highway to heaven. I do not pretend to understand heaven as he did. I only know that, once, heaven left coordinates in the language I trusted most.
A thermometer. A notebook. A name written before I arrived.
And a reading of 37.1°C, the temperature of someone alive.