Third Girl: 35

Three young women share a London flat. The first is a coolly efficient personal secretary; the second is an artist; and the third interrupts Hercule Poirot’s breakfast of brioche and hot chocolate insisting that she is a murderer – and then promptly disappears. Slowly, Poirot learns of the rumours 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…