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。
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