Soul Guard

What happens when your soul mate dies even before you meet them?
Kat is a 16 year old girl who doesn't even know if shell find love. She constantly feels like she is being followed and is saved from many things that she thins she probably should have died from.
Chris is 16 and dead. He died from an unexpected illness and without ever finding his true love. When he goes up to heaven only to be sent back down to guard his soul mate. A carless 16 year old girl who walks in the way of busses. He'll do anything to keep her safe including joining her school. But how will he convince her that they are soul mates, and how is she going to take it when she finds out he's a ghost.