In this breathtaking Agatha Christie mystery, theThird Girlsharing a London flat with two others announces to Hercule Poirot that shes a murderer and then disappears. The masterful investigator must figure out whether the missing girl is a criminal, a victim, or merely insane.

Three young women share a London flat. The first is a coolly efficient secretary. The second is an artist. The third interrupts Hercule Poirots breakfast confessing that she is a murdererand 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.