Beth, a thirteen-year-old white girl, is seemingly lost. She wanders around east London, seeking out help from strangers. But over the course of an evening, her interactions with the city's dwellers take darker turns. Terror appears to lie around every corner.

A storm rages and, in the darkest part of the night, a body is pulled from the swirling river. Across the city, two young women confront an uncertain future.

骁勇善战的奥赛罗（艾德里安·莱斯特 Adrian Lester 饰）爱上了元老的女儿苔丝狄蒙娜（琳赛·马歇尔 Lyndsey Marshal 饰），然而奥赛罗的身份卑微，两人的感情注定要经受风雨的打击。尹阿古（罗里·金奈尔 Rory Kinnear 饰）是奥赛罗手下的旗官，阴险狡诈的他妒忌奥赛罗的成就，想将其除之而后快。