Phoebe finds herself drawn to Mallory, the strange and secretive new kid in school. The two girls become as close as sisters, until Mallory's magnetic older brother, Ryland, shows up during their junior year. Ryland has an immediate, exciting hold on Phoebe. Soon she discovers the shocking truth about Ryland and Mallory: that these two are visitors from the faerie realm who have come to collect on an age-old debt.