Showing I'll Be Seeing You by Mary Higgins Clark

Young news reporter Meghan Collins is on an assignment in a busy casualty department of a New York hospital. A trauma team bring in a street mugging victim, a young woman robbed of her identification. The medics are working furiously to revive her, but finally give up, remove the oxygen mask that has covered her face and Meghan hurls head first into a living nightmare.

The face is a mirror image of her own...To add to the mystery of her murdered doppelganger, the recent death of Meghan's father is suddenly being treated as a suspicious case...As the links between these two mysterious stories increase, Meghan's own life could be in danger.