For Alex Mason, the landlord of a luxury apartment complex in northwest Philadelphia, his newest tenant, a professional young woman with excellent references, is almost too good to be true -- a stroke of good luck.

But then, as a series of mysterious incidents unnerve the other residents and cause damage to the property, Alex suspects his perfect tenant is the culprit.

Hindered by the state's laws and lacking evidence for law enforcement to intervene, he undertakes his own investigation, uncovering the woman's chilling past and her immediate threat to his family.

As the situation deteriorates and his tenant becomes more dangerous, Alex is forced to confront the unthinkable: how do I murder someone?