No Love Lost — Margery Allingham

BEFORE THE NIGHT WAS OVER, ONE OF THEM WOULD BE DEAD

There was selfish, beautiful Frances Forde, dying slowly of an overdose of narcotics…and Dr. Ann Fowler, whose lover Francis had stolen. Then there was the man Francis had married, betrayed and driven to insanity.

The two women had been lured to the madman's house, and now began the deadly duel -- as Ann tried to save her rival's life, and the wronged husband tried to destroy them both.