Give Up the Ghost - Megan Crewe - Bog

Cass McKenna much prefers the company of ghosts over "breathers." Ghosts are uncomplicated and dependable, and they know the dirt on everybody... and Cass loves dirt. She's on a mission to expose the lies and backstabbing between her fellow students.
But when the vice president of the student council discovers her secret, Cass's whole scheme hangs in the balance. Tim wants her to help him contact his recently deceased mother, and Cass reluctantly agrees.
As Cass becomes increasingly entwined in Tim's life, she's surprised to realize he's not so bad-and he needs help more desperately than anyone else suspects. Maybe it's time to give the living another chance...