S07E10: Ka Luhi (The Burden)

Five-0 investigates the 10-year-old cold case of a missing teen when a boy suffering from PTSD undergoes hypnosis and realizes he may have witnessed her murder. Also, Danny's sister, Bridget (guest star Missy Peregrym),visits Oahu for a business conference, and he suspects that she may be getting too close to a co-worker, on HAWAII FIVE-0