Parallel Spirits — Cassia Leo

Book One in the Carrier Spirits young adult paranormal romance series. After more than three centuries as a carrier spirit, Mara has finally found a willing host in eighteen-year-old Belinda. As a reward for Belinda's compliance, Mara sets out to help brokenhearted Belinda find love. With the promise of a new body, Mara dares to hope her plan may work--until Mara and Belinda both fall for sweet and charming Conor. But Mara's feelings for Conor aren't her only obstacle. A spirit with whom Mara shares a dark past is possessing Conor. Now a war is waging inside and outside Belinda's body and she quickly discovers what Mara has known for centuries: Falling in love is just as dangerous as battling evil spirits.