Broken Bones - The Ghost Ring Chronicles, #1

Bunny wants to put her life back in order. The ghosts have other ideas. Roman Asher didn't kill himself. That's what perky freshman Bunny Rainville thinks when she first learns about his apparent suicide in the library after hours. Bunny hardly has a chance to grieve before she finds a mysterious treasure packed into her mailbox: a magic ring that gives her the ability to see and speak to Roman again-as well as a number of other ghosts haunting the campus of Twin Oaks.
Unfortunately, Bunny's new treasure comes with a price, and she quickly finds herself the new target of the dark force controlling the school. Can she work with her deceased companions to solve the mystery of the murders of Twin Oaks without making herself the next victim?