After four years of trying to track her down, Jack is reunited with his estranged schizophrenic sister, Becky, and quickly makes her treatment his No. 1 priority. Things prove to be more difficult than expected when another family member arrives and offers unsolicited advice. As Jack tries to help his sister, Veronica enlists his help with Clay, an Iraq War veteran who was committed after he shot himself in the hand in front of his wife and son. As Clay continues to suffer from both amnesia and Post-Traumatic Stress Disorder, Jack struggles to help him remember the details of the wartime attack that left him traumatized. Meanwhile, Jack's own family ties provide unexpected insight into Clay's situation as well as his own life in the Lines in the Sand episode of Mental airing Friday, Aug. 7 (9:00-10:00 PM ET/PT) on FOX.