McNulty's on harbor patrol. Daniels is in the police-archives dungeon. Prez is chafing in the suburbs. Greggs has a desk job. The detail may be on ice, but corruption marches on . . . and a horrific discovery is about to turn the Baltimore shipping port inside out. Setting up in the wake of the first season's joint homicide/narcotics detail that exposed a major drug operation — and left its members stigmatized and reassigned — the second season expands to include not only familiar drug dealers, but a group of longshoremen and organized crime members who are caught up in a major homicide case.

On the drug-infested streets of West Baltimore, there are good guys and there are bad guys. Sometimes you need more than a badge to tell them apart. Season 1 follows a single sprawling drug and murder investigation in Baltimore — one that culminates in a complex series of dangerous wiretaps and surveillance.

出生于巴基斯坦移民家庭的高中生纳兹（里兹·阿迈德 Riz Ahmed 饰），偷偷开走父亲的出租车去赴一场朋友爽约的派对。他中途迷路，焦急之际搭载了带着落寞绝望表情的女孩安吉拉（索菲亚·布莱克-德埃利亚 Sofia Black-D'Elia 饰）。霓虹闪烁的海边，两人互吐 心声。纳兹随对方回到家中，在迷幻的氛围中一切自然而然地发生。可当他醒来时，却发现安吉拉已被人残忍杀害。他惊慌失措，夺路而逃，结果半路因酒驾遭到逮捕，继而因涉嫌杀害安吉拉遭到指控。在押期间，善于为边缘人辩护盈利的小律师约翰·斯通（约翰·特托罗 John Turturro 饰）决定帮他洗脱罪名。临近退休的警长丹尼斯（比尔·坎普 Bill Camp 饰）和检察官海伦（珍妮·柏林 Jeannie Berlin 饰）则磨刀霍霍，发誓要坐实纳兹的罪名。 被人称为有着“小鹿斑比似的大眼睛”的纳兹，更要在炼狱般的牢房内接收黑暗和罪恶的洗礼……

Season two examines the 1997 murder of legendary fashion designer Gianni Versace outside of his Miami Beach mansion by serial killer Andrew Cunanan, interweaving storylines involving the lead-up to the murder and the criminal investigation that includes a nationwide manhunt for Cunanan.

Counter-terrorism agent Jack Bauer attempts to stop the assassination of United States Senator David Palmer on the day of the California presidential primary, while those spearheading the assassination plot stop at nothing to exact revenge on Bauer and Palmer.