Margery Louise Allingham—an English writer of the “Golden Age of English Literature,” recognized as the “Queen of Detective Fiction” alongside Agatha Christie, Dorothy Sayers, and Ngaio Marsh. Allingham’s best-known works are the novels about the gentleman sleuth Albert Campion. In this volume are the first three novels of her main cycle. In “The Secret of Mysterious Mail Towers,” Albert Campion must unravel a complicated case. Val Giert was nearly made a victim of kidnappers. He has no idea how serious the danger threatening him is—unlike the mysterious Mr. Campion, an amateur detective, who tells him the news: a gang of daring thieves is hunting an ancient cup entrusted to Val’s family for safekeeping.