The road to hell is paved with good intentions, and it is a pity that Mrs. Bradley, who recommended her patient, the famous writer Hannibal Jones, to relax in the cozy and peaceful village of Saxon Wall, completely forgot this wise saying. Very soon a brutal murder occurs in the village. The provincial police are confused, superstitious local residents blame everything on the machinations of the evil spirit, but Mrs. Bradley, who does not believe in the devil, goes to Saxon Wall to personally bring the murderer to light... The famous archaeologist Sir Rudri Hopkinson has always been an eccentric person, but to go with all his numerous family to Greece to try to uncover the secret of the mysterious Eleusinian mysteries - this, perhaps, was too much even for him. Mrs. Bradley, condescending to the pleas of Sir Rudri's wife, joins the expedition - and she will not be bored, because she is the one who discovers the human head, hidden in a chamber where the sacred temple snakes were once kept. Accident? Or a hint at the motive for the murder?...