Still feeling guilty about her adoptive parents' death, Paige gets some help from Leo and the ghosts to go back to the day of their car accident so can work through her feelings and discovers how she was able to live through the accident. Meanwhile, Phoebe and Cole get possessed by a pair of ghosts who look to finish a job from 50 years ago, and as a result, Piper has to find a way to keep the ghosts in succeeding in their mission.