Oz is in upheaval following the return of Martin Querns; Howell and Robson receive troubling medical news; Brass makes his last shot Hoyt is reunited with his birth mother; Fr. Mukada answers an unsolved mystery; Arif disappoints his brothers; Alvarez succumbs to an enticing offer; the O'Reily family struggles to make amends; and the prison production of "Macbeth" ends with a staggering final act.