E-book exclusive extras: Christie biographer Charles Osborne's essay on The Body in the Library; "The Marples": the complete guide to all the cases of crime literature's foremost female detective.

The very-respectable Colonel and Mrs Bantry have awakened to discover the body of a young woman in their library. She is wearing evening dress and heavy make-up, which is now smeared across her cold cheeks. But who is she? How did she get there? And what is her connection with another dead girl, whose charred remains are later discovered in an abandoned quarry? The Bantrys turn to Miss Marple to solve the mystery.