As the threat of world war looms large, Poirot seeks the help of friends both old and new when he is pitted against a dangerous group of dissidents responsible for a series of violent murders.

Hercule Poirot
George
Captain Arthur Hastings
Assistant Commissioner James Japp
Miss Felicity Lemon
Dr. Ivan Savaranoff
RΓ©gine Olivier
Flossie Monro
Stephen Paynter
Diana Paynter
Dr. Quentin
Gerald Paynter