The Lost Heroine (Heroes of Olympus/Kane Chronicles crossover) [2016]

Annabeth Chase wakes up in an unfamiliar house, surrounded by people in white bathrobes and weird necklaces. At the same time, Sadie Kane opens her eyes to find herself in a small, gray and silver house full of books, with a dark haired, sea-green eyed boy staring down at her. Neither of them can remember much more th...