Medium - Season 5 Episode 4 -

Allison has a serious memory lapse and can't account for her absence. One moment she's in the grocery store parking lot talking to Ariel on her cellphone and the next - six hours later - she wakes up under a freeway overpass. She is soon dreaming about a hit and run victim and fears that she may have been the driver of the car. Her undamaged car is recovered minus her purse which she eventually retrieves from a dumpster. The purse however contains a human hand in a plastic bag. Ariel has reached a certain age - where she can get her learner's permit and start driving....