An emaciated stranger approaches Hercule Poirot, shouts a warning about "the big four" and drops dead. Who knew Poirot's inquiry into the man's odd behavior would lead to an underground laboratory, an insane asylum, and rumors of a secret weapon?

שם הספר
Passenger to frankfurt - AN EXTRAVAGANZA
Elephants can remember
The a.b.c. murders - A HERCULE POIROT NOVEL
Death Comes as the End
Lord edgware dies