<b>A serial killer crashes Detective Michael Bennett's wedding.</b> <br> Weeks before NYPD Detective Michael Bennett is to marry his longtime love, Mary Catherine, an assassin announces his presence in the city with a string of grisly murders. Each victim is a young woman. And each has been killed in a manner as precise as it was gruesome.<br> <br> Tasked with working alongside the FBI, Bennett and his gung-ho new partner uncover multiple cold-case homicides across the country that fit the same distinctive pattern -- proving the perpetrator they seek is as experienced at ending lives as he is at evading detection.<br> <br> Bennett promises Mary Catherine that the case won't affect their upcoming wedding. But as Bennett prepares to make a lifetime commitment, the killer has a lethal vow of his own to fulfill.