In 2011, Robyn Gardner vanished while on vacation in Aruba with her 50-year-old travel companion, Gary Giordano. Aruban authorities considered Giordano the prime suspect but, but he was never charged in connection with her disappearance. Giordano denies any wrongdoing, but Gardner’s body was never recovered, and questions remain. Dr. Phil sits down with Gary to sort through the details and accusations in search of answers. What happened to Robyn Gardner? Find out why Robyn’s sister, Danielle, says she knows her sister didn’t drown that day. Will Gary -- who maintains his innocence -- take a polygraph test?