Miss Marple must solve a murder that is published before it happens.

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An announcement in the local paper states the time and place when a murder is to occur in Miss Blacklock's Victorian house. The victim is not one of the house's several occupants, but an unexpected and unknown visitor. What follows is a classic Christie puzzle of mixed motives, concealed identities, a second death and a determined inspector grimly following the case's twists and turns. Fortunately, Miss Marple is on hand to provide the solution – at some risk to herself – in a dramatic final confrontation.

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In a classic Agatha Christie tale of concealed identities, desperation, mixed motives, and another death, it takes a risky strategy to uncover the true identity of the murderer.