Sixteen-year-old Susannah Simon, a liaison between the living and the dead, hopes to be able to live as a normal teenager after moving from New York to California with her mom and new stepfather, but on the first day of school she encounters the very hostile ghost of a girl who committed suicide over winter break and is out for revenge against her former boyfriend.

All Susannah Simon wants is to make a good impression at her first job since graduating from college (and since becoming engaged to Dr. Jesse de Silva). But when she's hired as a guidance counselor at her alma mater, she stumbles across a decade-old murder, and soon ancient history isn't all that's coming back to haunt her. Old ghosts as well as new ones are coming out of the woodwork, some to test her, some to vex her, and it isn't only because she's...

Sixteen-year-old Susannah Simon is a mediator, one who communicates with the dead, and she also happens to be in love with Jesse, a nineteenth-century ghost.