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**The ultimate locked-room mystery awaits. **
In The Fourth Door, a murder in a sealed room and another in snowbound isolation defy reason, yet Dr. Alan Twist proves that even the impossible has a rational explanation. Hailed as the French successor to John Dickson Carr, Paul Halter’s ingenious storytelling delivers twist after twist, reminiscent of Anthony Horowitz and Knives Out. Winner of the Prix du Roman Policier, this is an essential read for fans of cunning puzzles and atmospheric thrillers.