This is about a psychotic who has a foot in the Bluebeard stories and another in Gaslight. The victim is his current, quite beautiful wife. He announces to her after a party that he has killed seven other women and she is going to be the eighth. He even announces when he will kill her. Unfortunately, her pleas are seen as female hysterics (it's another time). Also, the man is an art collector of great repute and he is admired everywhere. He sets her up so that no one will believe her story; no one, that is, except Sherlock Holmes. His keen insights make him suspicious and although he screws up a couple times, he maintains his relentless bloodhound mentality. This is quite suspenseful and the young woman is a very sympathetic heroine. A good mystery and pretty well presented.