Locking your frenemy in a book with a serial killer is a bit much for a wacky comedy.
(It always amuses me, in a dark way, the way that the fairy-tale Bluebeard has almost entirely eclipsed his inspiration — Gilles de Rais, former battle companion to Joan of Arc. After La Pucelle was executed without being rescued by his King or his God, his faith in both was shattered; he returned to his estates where he embarked on an epic career in black magic, rape, and mass murder. Where the fictional Bluebeard killed off wives, the real one mostly went for little boys.)