Three young women share a London flat. The first is a coolly
efficient secretary. The second is an artist. The third interrupts
Hercule Poirot's breakfast confessing that she is a
murderer--and then promptly disappears. Slowly, Poirot learns of
the rumors surrounding the mysterious third girl, her family, and
her disappearance. Yet hard evidence is needed before the great
detective can pronounce her guilty, innocent, or insane....