Popular Library 61 (1945)

Synopsis:

When the Mad Hatter twitched off the headgear of important citizens most people regarded it as a joke. But the lifeless body of Philip Driscoll gave no cause for laughter. Driscoll was found on the steps of Traitor's Gate at the Tower of London. A crossbow bolt was driven through his heart and a stolen top-hat was on his head.

Faced with a daring killer who left his signature at the scene of his crime, the police called in Dr. Gideon Fell to solve Driscoll's murder and to unravel the riddle of the little plaster dolls, the strange voice and the theft of a manuscript worth ten thousand pounds.