私家侦探Tommy Akhtar （里兹·阿迈德）在追查失踪俄国妓女的过程中发掘出一连串暗黑秘密，也牵扯出了关于自己和伦敦这座城市的不堪真相。这部犯罪悬疑电影根据Patrick Neate的小说改编，由BBC和BFI联合出品。

　　When 10-year old Olivia's Mom goes on a business trip for the weekend, she leaves Olivia home alone with her 17-year-old brother Miles in charge. The first night, Olivia falls asleep on the couch, and wakes up, not realizing how late it is. She walks her dog Charlie without Miles knowing, and witnesses a young woman being kidnapped on the empty New York City streets. Olivia runs home and tells Miles, but he doesn't believe her. The next morning, she explains what happened to local cops, and they don't believe her either! Only a cynical female detective named Dottie (played by Academy Award winner Susan Sarandon) listens to Olivia, but she too is skeptical. Undaunted, Olivia bravely launches her own investigation, putting herself into perilous situations. Her can-do spirit ignites one extraordinary adventure after another. Can she outwit the bad guys and convince her brother and Dottie of the truth in time to save the day?