The Adventure of the Seven Clocks

"The Adventure of the Seven Clocks" is a Sherlock Holmes story by Adrian Conan Doyle and John Dickson Carr. The story was published in the 1954 collection, The Exploits of Sherlock Holmes. 
Holmes is consulted by a young lady, a companion to an older woman, about the eccentric behavior of a young man she has met. He behaves normally, but becomes a raging maniac whenever he encounters a clock. The young woman personally has seen him smash two clocks and heard from the man's servant of five other incidents. Holmes must travel to a distant seaport to gather information to resolve a horrible, terrorist scheme and solve the mystery of the aberrant behavior.
de:Sieben Uhren
Category:Adaptation: short story