Two gentlemen meet on a train and engage in a conversion of how each of them would commit a murder.

One of the gentlemen tells the other that he knows how to commit the perfect murder by inducing a certain drug before the suspect immerses in a hot bath and dies of what looks like an unsuspicious heart attack. He then departs the train at Rugby to attend a little business there. The next day the other gentleman reads in the paper of a death in Rugby where a man has died in a hot bath of a heart attack and he becomes suspicious of the man he met on the train.

Produced and directed by: William Spier

Written by: Dorothy L. Sayers (1933)