After a shootout claims the life of his partner in a condemned tenement building on Pearl Street, Detective John Tallow unwittingly stumbles across an apartment stacked high with guns. When examined, each weapon leads to a different, previously unsolved murder.

Confronted with the sudden emergence of hundreds of unsolved homicides, Tallow discovers that he's walked into a veritable deal with the devil. An unholy bargain that has made possible the rise of some of Manhattan's most prominent captains of industry. A hunter who performs his deadly acts as a sacrifice to the old gods of Manhattan and who may, quite simply, be the most prolific murderer in New York City's history.