The Penny Black theft

The Penny Black theft was presented as both a museum robbery and a carefully staged detective-story puzzle. In John Wigfull’s reconstruction, the stamp was stolen as part of a plan that also involved a false tip-off, rhyming riddles, and the dramatic planting of the missing cover in Milo Motion’s copy of The Hollow Man. Its later discovery turned a theft into a challenge aimed at both the police and the Bloodhounds.

Planning and chronology

Wigfull argued that investigators had concentrated too heavily on the events of the previous Monday evening, when the stamp’s appearance in the book came to light. The theft itself, he said, had occurred the week before. On Thursday, the police received an erroneous tip-off from Bristol; on Friday, they received the first rhyming riddle, and the theft at the Postal Museum took place that same morning. To Wigfull, the sequence showed that the crime had been planned in advance rather than improvised around the later meeting.

He linked the tip-off to Sergeant Plant, the riddles, the museum theft, and the placement of the stamp in Motion’s book as interlocking parts of a single undertaking. The apparent misdirection was not incidental: it helped shape a puzzle whose later solution would seem to involve a closed circle of suspects and a locked room.

The planned discovery

The perpetrator, Wigfull reasoned, needed inside information about the Bloodhounds’ next meeting. Motion was expected to bring his copy of The Hollow Man and read from it because the group was due to discuss locked-room mysteries. The book contains a well-known chapter on that subject, making it the precise point at which the missing Penny Black cover could be revealed for maximum effect.

The cover was discovered as Motion was about to read that chapter aloud. The timing made the book’s contents part of the apparent crime scene: a discussion of fictional locked rooms coincided with a real question about how a stolen object had reached a supposedly secure boat. The stunt depended not only on access to the book, but on foreknowledge of how and when it would be used.

The boat and the apparent puzzle

By the time the cover was found, the book had been aboard Motion’s narrowboat all week. Wigfull described the boat as secured by a bolt inside at the prow and a sturdy padlock outside. He interviewed Motion at length; Motion came to the police promptly, and Wigfull concluded that he was not the thief. Motion was genuinely shocked and could not explain how the cover had appeared there, while insisting that the boat was exceptionally secure.

Those circumstances gave the theft its locked-room aspect, but Wigfull’s account shifted attention away from the Monday meeting and back to the earlier planning. The padlock and the boat’s security made the discovery look like an impossible intrusion; the coordinated chronology suggested instead that the apparent impossibility had been prepared as part of the performance.

Intended effect and significance

Wigfull believed the thief had always intended to return the stamp after making fools of the police and the Bloodhounds. In this reconstruction, the object’s disappearance and reappearance belonged to the same design: the theft supplied the crime, while the riddles and planted discovery transformed it into a public intellectual challenge. The stamp was therefore not merely missing property. Its movement through the plan gave the episode its theatrical structure and made the locked-room puzzle appear to step out of detective fiction and into the investigators’ own case.