Rita's estranged mother (JoBeth Williams) visits and senses something is wrong with Dexter; Masuka thinks he's developed a lead in the Bay Harbor Butcher case, which has Dexter concerned; Doakes heads a murder investigation involving a military special-ops ranger; Dexter's sponsor has some unconventional ideas about helping him; Angel's interrogation of a witness crosses a line. ~ Ray Stackhouse, Rovi