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.

Created by and starring Emmy-winner Mark Gatiss (Sherlock), with Polly Walker (Bridgerton) and Connor Finch, this witty, atmospheric crime drama became U&alibi's second-highest performing premiere ever.