When seventeen-year-old actress Kelley Winslow meets Sonny Flannery, she discovers he is a changeling and guardian of the gate between the faerie Otherworld and the mortal realm. She also learns that her mother had otherworldly powers that she has passed on to Kelley.

Sonny Flannery joins a group of underground Lost Fae as he struggles to recover from his heartbreak over Kelley Winslow, while Kelley tries to uncover who is hunting Sonny's Green Magick so that she and Sonny can be together again.