 Mirabelle is assisted once again by the upbeat Vesta Churchill as they explore an underworld of smoky nightclubs, jazz bars, and intriguing characters to gather information and seek answers.Detective Superintendent Alan McGregor keeps an eye on Mirabelle's activities as a fledgling romance blooms between the two.London Calling explores the jazz scene of 1952 London, a period of great social change amidst post-war austerity.