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An action-packed mystery adventure by Germany's Number One bestselling author: choose your adventure when you open DOOR ?, DOOR ! or DOOR X. This omnibus edition includes Doors ? Colony, Doors X Twilight and Doors ! Field of Blood. When his beloved only daughter goes missing, millionaire entrepreneur Walter van Dam calls in a team of experts - including free-climbers, a geologist, a parapsychologist, even a medium - to find her .