 When Kelly Peyton steals some software from a CIA warehouse concerning the late Michael Vaughn, Sydney is soon abducted by Prophet Five agents where she is subjected to a hypnotic state making her flash back to her happier times with Vaughn in order to learn where a supposedly powerful device, called The Horizon, is located. Meanwhile, Jack must team up with Renée to locate Sydney when they captured and torture Aldo Desantis, while the mastermind behind Prophet Five is finally revealed... and why the person has a strong interest in Sydney s unborn daughter.