As tension builds, the staff rebel and the Walsingham Hotel lists like an old ship, can Book unmask Captain Orr's murderer?

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.