The Dirt on Ninth Grave (Charley Davidson #9) by Darynda Jones

In a small village in New York lives Jane Doe, a girl with no memory of who she is or where she came from. So when she is working at a diner and slowly begins to realize she can see dead people, she's more than a little taken aback. Stranger still are the people entering her life. They seem to know things about her. Things they hide with lies and half-truths. Soon, she senses something far darker.

A force that wants to cause her harm, she is sure of it. Her saving grace comes in the form of a new friend she feels she can confide in and the fry cook, a devastatingly handsome man whose smile is breathtaking and touch is scalding. He stays close, and she almost feels safe with him around.