I'm not a bad person, but maybe I did a bad thing.... Life is good for Anna Wright. She's a successful media executive working for one of the UK's largest TV corporations. She's got a great boyfriend, some close friends and a lovely home. She adores her dog, Wispa, and she loves to run to help her destress. But Anna's perfect life starts to crumble from the moment when, out jogging on the Heath one day, she meets a handsome stranger. She takes a route into unfamiliar territory, and then she has to face the consequences. There's a dark, growing creepiness as the atmosphere becomes unsettled, and, as Anna's professional life becomes increasingly pressured and poisonous, her obsession with the intriguing stranger intensifies.