The Ghost Of Darwin Stewart #1 by L.G. Nixon

A girl, a ghost, and a magical artifact. What could go wrong?

Summer vacation is all fun and games for Lucy Hornberger...until she's attacked by a smelly ghost and followed by a terrifying shape-shifter who declares he must retrieve an ancient artifact called the Spectrescope, which Lucy happens to have in her possession. The Spectrescope has revealed a beguiling reality filled with magic, spirits, and Irredaemons who have crossed into her world. Lucy has discovered deep secrets that could destroy both realities.

Entangled in an unbelievable struggle against a spirit world she never knew existed, Lucy's understanding of reality has her questioning everything. Once things of fantasy, ghosts, spirits, shapeshifters, and magical objects are suddenly real and menacing.

As the entities pursue the Spectrescope, Lucy must search for a way to defeat the spirits and discover the truth about the unseen realm.

Lucy must decide—should she protect the artifact and defend her world against this evil that is threatening it? Or give it up to protect herself and her loved ones? And at what cost to the innocent? Can someone called the High King help her in this fight against the Dark Prince?