Will is the happiest he's ever been but his world will be rocked by a terrible accident. He's always preached the word of a compassionate God – but how can he now, when his despair leads him on a dangerous downward spiral?Geordie has found a new contentment in his relationship with Cathy, but when they are both confronted with shocking announcements at work their happiness is threatened. As Mrs C, Leonard, Jack and Daniel rally around, both Will and Geordie find themselves in unfamiliar, emotional waters and murder is always around the corner. The eighth season of Grantchester will range from Speedway to spies, exploring the lives of invisible women and the very visible problems caused by Leonard's new vocation which may, once again, find him battling the law.    Exploring faith, forgiveness, and redemption – this explosive series tests Will and Geordie to the limit.