One night, Arthur Bryant witnesses a drunk middle-aged lady coming out of a pub in a London backstreet. As their new team at the Peculiar Crimes Unit goes in search of a madman, the octogenarian detectives ready themselves for the pub crawl of a lifetime, and come face to face with their own mortali...

One night, Arthur Bryant witnesses a drunk middle-aged lady coming out of a pub in a London backstreet. As their new team at the Peculiar Crimes Unit goes in search of a madman, the octogenarian detectives ready themselves for the pub crawl of a lifetime, and come face to face with their own mortality...