《深蓝》主要讲述洛杉矶警察局卧底小组的故事。这些人「潜藏」得很深，亚洲区以至于他们的很多同事根本不知道他们在干卧底工作。Carter Shaw是该小组的行动负责人，亚洲区但他经常和自己的上级闹矛盾－－当然，他这也是为了自己的同事好，因为卧底工作实在太危险了。在第二季中，Carter Shaw将被迫接受FBI探员Alex Rice（Tricia Helfer）的「领导」，与FBI合作调查几起重要案件。Alex的到来，也将使Carter的个人生活发生巨大改变。卧底小组的其他成员包括：Ty Curtis，工作已经导致他和妻子的感情出现裂痕；Dean Bendis，行事鲁莽，如果他不同意上级的命令，他会毫不犹豫地按照自己的想法去行动；Jaimie Allen，曾经当过巡警，很会掩饰自己的过去，Carter挑选她正是看中了她的这个「特点」。
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红辣椒乐队
回复 :Detective Inspector John Rebus is a hard drinking, unkempt, womanizing police officer whose job is his whole life. He is the most senior and most experienced DI at his station. He has a mysterious past that his partner DS Siobhan Clarke learns about from time to time through various comments Rebus makes. She is a young woman who wants to succeed, but does not have much of a personal life. She feels being paired with Rebus jeopardizes her career because of his unorthodox methods, but she is also fascinated by the man and is extremely loyal. DI Rebus' boss is Chief Superintendent Templar, a woman who was one of Rebus' lovers in a distant past. Their relationship is now one where they barely tolerate each other.
回复 :尽管Jenna现在和Jake在一起，但Jenna和Matty过去交好的秘密录像可能遭到泄露，如果所有人都知道这件事就麻烦了！Jenna为了阻止这件事发生决定采用非常规手段。
