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.

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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.

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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.

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