Alan Billis, a taxi driver from Torquay dying of terminal cancer, donates his body to science for an experiment no one has attempted in three millennia: a full ancient Egyptian mummification, carried out after his death exactly as he wished. Inside a UK forensic pathology lab, a team of scientists and archaeologists tries to reconstruct the techniques used during Tutankhamun's era, testing theories about natron salt, resin, and the order of organ removal against Billis's actual body rather than a replica or animal carcass. The film intercuts the mummification process with research into Egyptian burial texts and museum specimens, as the team debates which ingredients actually halted decomposition for thousands of years and which are guesswork inherited from earlier Egyptology. Billis, interviewed before his death, explains why he wanted his body used this way instead of a conventional funeral. The result is a hands-on test of a historical mystery, watched through a genuinely unusual real experiment rather than a dramatized reconstruction.