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.