Post-WWII London is a dangerous place. Especially for men like Gabriel Book. But every good bookseller needs a hobby -- and Book's is solving murders.

In post-war London, Gabriel Book, a literary enthusiast and bookseller, combines his day job with his favorite hobby--helping solve knotty murder cases. Although happily married to his best friend, Trottie, Book is a gay man at a time when homosexuality was illegal. When a new assistant, Jack, arrives at the bookshop, it soon becomes clear his appointment wasn’t as random as it at first seems.