When a young man is found dead and stark naked out on the Fens, Will and Geordie discover ties to a Cambridge research project experimenting with mind altering drugs.
Set against the backdrop of the real hamlet of Grantchester, the drama focuses upon the life of Sidney Chambers, a charismatic, charming clergyman who turns investigative vicar when one of his parishioners dies in suspicious circumstances.
Grantchester - Series 5, Episode 4 Synopsis and Schedule