The Williams twins have been cordially invited to join the Ravens of Passage, a secret society dedicated to the acquisition of forgotten magic. In exchange for their loyalty and allegiance, they are promised a remedy for their mother's cancer. So when their mother's health takes a turn for the worse, they have no choice but to seek the Ravens help.But before they can be initiated into the flock, they must prove their worth by braving a set of trials located in the hellish outskirts of Comagique University, known as the Forbidden, where unspeakable monstrosities plague the land and await their next meal. However, if either Skye or James fails to pass their tests, they will ultimately fail their mother in the process and each other.