Father Brown is staying as the guest of a retired colonel when his host is found dead, stabbed with a narrow blade, but no murder weapon. The police inspector gathers all the suspects together, but Father Brown has the answer.

A self-styled "priest of Apollo" persuades a follower to alter her will, then she falls down a lift shaft and dies. Father Brown suspects murder.

A controversial magistrate is shot and killed. A suspect is brought to trial, but Father Brown believes a broken mirror establishes the truly guilty party.

A man who has dabbled in black magic calls Father Brown to confess his sins, but too late. Father Brown investigates when the man's sons start to die in suspicious circumstances.

Father Brown is staying with an old friend, who is killed, apparently while burgling a house. Brown tries to establish his friend's innocence.

Father Brown is called to investigate the beheading of a man, commited in a closed garden. Soon there seems to be some problems: How could the murderer get the body out of the garden? And how did the murderer get away? Soon after the first murder a head is discovered into the Seine. The solution to the murder is simple and brilliant.