Definition of Obsession

Olivia King has become the person she despises most, a killer. Being trapped inside a mental institution, Olivia turns on those she called her friends in order to escape. She's been touched by the darkness too many times and will destroy anyone who gets too close. But what will happen when her mission forces her to work with her own abuser to take down a much bigger threat?...Will they be able to resolve their differences?... Not likely.