Carrie 's investigation of Brody is complicated by her bipolar disorder and results in an obsession with her suspect .
After a U.S. Marine sergeant named Nicholas Brody is rescued from captivity , Mathison believes that he is the POW described to her .
Carrie 's investigation of Nicholas Brody is complicated by her bipolar disorder and results in an obsession with her suspect .
After a U.S. Marine sergeant named Nicholas Brody is rescued from captivity , Mathison believes that he is the POW described to her .