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.

　　New Year's Eve celebrations are cut short when a masked man stabs a woman in her own home. Jack and the team must uncover the identity of the murderer before they can strike again.

　　《追影逐凶》聚焦的是一个失踪人口调查分队，他们的任务就是追查那些专门针对社会上的弱势人群下手的连环杀手，Reece Shearsmith此次饰演的是Sean Stone是一个患有社交障碍的人，执迷于破解各种暗号，并从中发现行为模式。

　　BBC一口气续订《天堂岛疑云》第13、14季，以及两集圣诞节特别篇。