Crime at Black Dudley - Margery Allingham

During a house party at Black Dudley, a country mansion, the host is murdered and an important item disappears. A criminal gang holds the guests hostage, demanding the return of the missing item. After a series of thrilling episodes, laced with humor, the guests escape. Albert Campion is one of the guests. In later Allingham novels he solves the mystery. But this time one of the other guests finally figures out who done it. (Summary by TCallan)