Deborah和Ava努力让她们的深夜节目开播并创造历史，紧张气氛随之升温。
部落警察Joe Leaphorn正在调查一名与神秘邪教有关的男子的死亡，而兼职私家侦探Jim Chee正在处理自己的案件。当调查发生冲突时，Leaphorn和Chee发现自己处于严重的危险之中。
本剧改编自BBC Radio 4非常成功的广播剧《Annika Stranded》，由Nick Walker创作。Nicola Walker饰演主角Annika Strandhed，一名敏锐、机智又神秘的督察。剧集讲述Annika领导一支新组建的海上凶案专家组，负责调查发生在苏格兰航道上原因不明、残忍恶劣，看上去难以解释的谋杀案。
故事设定在第二季事件的152年后。
As DI Geordie Keatingand Reverend Alphy Kottaram continue to work together as a crime-solving duo in scenic Grantchester, they must also support each other through changing times, family struggles, and personal secrets. This season, Alphy feels like he’s found a home, but he’s forced to confront secrets he’s kept close to his chest. Will he be able to let anyone fully in, or mu...
