In series 4 a bucking bronco goes haywire on the set of a game show, a killer scarecrow stalks the streets of Great Slaughter, the Scottish invade, a femme fatale drops to her death in a stunt gone wrong and to top it all CC Lowsley has arranged something called "team building". Meanwhile Reverend Mother Adrian is keeping a secret, one that could tear the Sisters lives apart as they know it…

Criminals, say your prayers. The Cotswolds' crime-solving, Vespa-driving nun returns in this lighthearted Father Brown spin-off. With her aptitude for detective work, Sister Boniface is Great Slaughter's secret weapon when it comes to busting countryside killers.

Sister Boniface Mysteries centers on Sister Boniface, who is using advanced techniques for tracking down killers and acts as a scientific advisor to the police, working alongside Detective Inspector Sam Gillespie and Detective Sergeant Felix Livingstone.