When a student's school reports a girl missing, the squad must track down a trusted family friend for answers. Benson gets a Mother's Day surprise.
Harper gets caught in a firefight when she, Abe and Maya travel to Syria to investigate a Marine accused of desertion. Also, Col. Turnbull travels to Germany to be with her wounded son, Adam (Derek Klena).
When a Marine is accused of helping a terrorist escape from Guantanamo Bay, Abe and Harper believe that they have an open-and-shut case until they are mysteriously denied access to key evidence without explanation. Also, Trey and Maya attempt to get Rami reassigned back to their office.
Abe and Harper's investigation into a Marine recruiter's alleged misconduct may be derailed when the key witness refuses to testify.