Colin (Idris Elba), a violent man in jail who fails to get his parole, escapes and returns to where he used to live. He has car problems and wanders to the nearest house, telling them he was in an accident and needs help.This is the home of Terry and her children, who are alone while the husband is away on work. Colin infiltrates himself into her family, at first seeming like a good guy but quickly becoming more and more threatening until it's revealed why he's actually there.
This is basically a serial killer movie and Idris (LUTHER) is great as portraying a bad guy.