Plot: When 30 decapitated Romans were found buried in York in February 2005, archaeologists were baffled by their presence. Had these bodies been beheaded because of Roman superstitions about ghosts or were they victims of a brutal act of revenge or war? Timewatch follows the investigation that has since taken place and shows how experts came to the conclusion that these men were caught in a bloody power feud to succeed Emperor Septimius Severus, who died in the city in AD 211