Seventeen-year-old Rue doesn't need anyone other than Ghost, her not-so-imaginary best friend. They've been inseparable for as long as Rue can remember and she shares everything with Ghost.

The day before Rue returns home from school for the long holiday, Ghost disappears. Ever-fretful Rue tries to tell herself it's fine, but she knows something is horribly, terribly wrong. She'll have to overcome her anxiety find her courage and push her boundaries further than she ever thought possible in order to save her best friend, and perhaps make some new ones as Rue finds herself drawn into the fringes of a secret battle for human survival.

Soft science fiction meets fantasy in this exciting novella-length adventure of daring and friendship.