PBS is known for introducing American viewers to British TV series like Downton Abbey, which proved so popular that it was followed by two spinoff movies and paved the way for the series Grantchester. The mystery, set in 1950s Cambridge, initially followed Anglican vicar Sidney Chambers, who had a secondary career as a detective alongside Detective Inspector Geordie Keating.
Source：https://www.cbr.com/grantchester-why-james-norton-left/
