NYPD Detective Tommy Keane has spent nineteen years chasing criminals in the Bronx - investigating unimaginable crimes and solving near-impossible cases. When a punitive measure forces Keane to transfer to the relatively quiet 21st Precinct in Manhattan, he expects his last thirteen months before retirement to be painfully easy. But as the grisly murder of a celebrated nun soon proves, even the safest neighborhoods can have their secrets, and even the most seasoned detective can be surprised by the disturbing and unspeakably cruel acts humans can commit, and endure.