Grantchester, series 4 episode 1, review: Don't write this crimebusting clergy drama off as cosy, it's much deeper than that

• Certain series are derided – usually by people who haven’t seen them – as cosy or sentimental when, at their heart, they hide something flintier, deeper and darker. Call the Midwife is one such, and Grantchester another. You can see why these assumptions are made – television shows featuring crimebusting clergy don’t tend to push boundaries or probe taboos, whether it’s Tom Bosley in Father Dowling Mysteries or Mark Williams in Father Brown.