In season 13 of BLUE BLOODS, the job takes a dangerous turn for the Reagans when Eddie and Jamie deal with a domestic violence case associated with an investigation led by Danny and Baez. Also, Frank and his friend, Archbishop Kearns, go on a mission to avail themselves of an unfiltered look at the city; and Erin is presented with a surprising offer by her ex-husband, Jack Boyle, regarding her run for District Attorney.