Spots 
Fog wraps the working-class district of Bow as landlady Mrs. Drabdump fails to rouse her lodger, Arthur Constant. Retired detective Edward Grodman forces open the sealed bedroom door, revealing Constant with his throat slit. The door was bolted from within, the window latched, and no weapon lies inside the room. An insoluble paradox presents itself to Scotland Yard before the investigation even begins.
Inspector Wimp of Scotland Yard clashes with Grodman, desperate to solve the locked-room enigma first. Wimp builds a circumstantial case against labor organizer Tom Mortlake, framing political rivalry and personal motives around the dead philanthropist. Mortlake is arrested, tried, and sentenced to hang despite the absence of direct physical proof. Ambition pushes the police system to prioritize a tidy guilty verdict over fundamental truth.
Hours before Mortlake reaches the gallows, Grodman publishes a full confession detailing his own orchestration of the crime. Grodman cut Constant's throat himself in the confusion of breaking down the door, turning a natural death or suicide into an uncrackable mystery. He sacrificed an innocent life and staged an impossible crime solely to demonstrate his intellectual superiority over Inspector Wimp.
A classic locked-room mystery exposing human vanity, flawed police logic, and the dark art of deception.