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 visits Oahu for a business conference, and he suspects that she may be getting too close to a co-worker.

Chin is kidnapped by a cartel in Mexico and Five-0 races to rescue him before he is executed by his vengeful abductors. Meanwhile, Grover goes undercover as a car salesman to investigate a murder that turns out to be far more complex and dangerous than expected.