In the peat bogs of central Ireland, two Iron Age bodies surface with skin, hair, and fingernails still intact, preserved by the same acidic, oxygen-starved conditions that once made these wetlands treacherous to cross. NOVA follows the archaeologists and forensic scientists who examine the remains for clues to how these men died and why, reading cut marks, stomach contents, and burial placement for signs of ritual killing rather than accident or ordinary death. The film treats each body as a case to be solved, moving from the bog itself to the lab, where CT scans and chemical analysis stand in for the autopsy neither body ever received in its own time. Along the way it sets the finds against what is known of Iron Age belief, weighing sacrifice and kingship rites as explanations for why someone would be killed and deliberately placed in a bog built to preserve them. The bodies stay unnamed; the questions around them do not.