Three Is a Lucky Number by Margery Allingham

A charming bachelor plans to murder his third fiancée just as he did the previous two, believing he’s perfected the art of getting away with it. But this time, his bride-to-be has secrets of her own—and he may not be as clever as he thinks. The plot builds with dark humor and ironic tension. A wickedly sharp tale of predator and prey. Sometimes, luck runs out when you least expect it.