Grantchester

Pretty sure Geordie is on his third vicar-assistant in Season 10.  

It's never quite clear how Inspector (Geordie) Keating manages to make friends with each new vicar and drag him into the murder case, but in all 10 seasons, it's a detective and a preacher who become partners in crime solving.  

Every episode has a murder, of course--or what would Geordie do?  But the charm of this Masterpiece series rests on the interactions, romances, and collisions among the characters in Grantchester. 

We have Leonard and his partner who finally came out as gay a few seasons back.  The on-again, off-again relationship between Geordie's secretary and one of the detectives on his team. Geordie's marriage to Cathy has had some bumps along the way, but they now seem solid --just when Geordie discovers his son dressing up like a girl in this season.

And of course, there is the college of Oxbridge, site of a few random murders.

Over ten years, the vicarage housekeeper (Mrs. M) has moved from a typical homophobic woman of her times to a fiercely protective mother-figure to Leonard.  The developments in the characters along the way has made this one of PBS' best shows.