We're transported back to the tropical island of Saint Marie, and this time with a new Detective Inspector in place - but will DI Mervin Wilson remain in the job for long? Following the recently cracked case of ‘who shot the Santas?’, along with the revelation that his estranged mother has passed away, Mervin is ready to get back home and leave the island for good. But when a case close to the hearts of those at the station presents itself, is he tempted to extend his stay?
  As Mervin continues to ruffle feathers, the police team pull together to solve some of the island’s most confounding cases yet.

我们再次回到热带岛屿圣玛丽，这次迎来了一位新的侦探督察——但默文·威尔逊督察能在这个岗位上待多久呢？在侦破了“谁枪杀了圣诞老人？”这桩悬案之后，再加上他疏远的母亲去世的消息传来，默文准备回家，永远离开这座岛屿。然而，当一个与警局同事息息相关的案件摆在他面前时，他会不会动摇，选择留下呢？

默文的种种举动引发了不少争议，但警队上下齐心协力，共同侦破岛上一些最棘手的案件。