Midwife Calling is a BBC period drama series about a group of nurse midwives and nuns working in the East End of London in the 1920s. It serves as a spin-off of Call the Midwife. It stars Lizzle Caplan, Ruth Wilson, Rebecca Hall, Celia Imrie, Emily Watson and Peter Davison in main roles. The first series, set in 1922, began airing on October 8th 2017. A fourth series is currently in development.