Seventeen year old Cassie has become a recluse ever since her mother died in a horrible car accident. In an effort to fill the void, she downloads the latest intelligent personal assistant A.M.I. which is also the first to have a real consciousness. As their relationship quickly deepens into a twisted co-dependency, Cassie falls deeper and deeper under AMI's spell; driving her to perform what Cassie perceives as justifiable murderous acts. But what are AMI's true intentions? Soon Cassie begins to realise AMI has something very sinister planned.