Rachel Gardner wakes in a vast, trap-filled building with no memory of how she got there. She teams up with the enigmatic killer Zack, trading help for answers as they descend floor by floor, each level ruled by a deadly resident and full of clues about their pasts. Their uneasy pact between victim and predator drives them toward a tense escape and the truth behind the fortress.

Rachel Gardner wakes in a vast, trap-filled building with no memory of how she got there. She teams up with the enigmatic killer Zack, trading help for answers as they descend floor by floor, each level ruled by a deadly resident and full of clues about their pasts. Their uneasy pact between victim and predator drives them toward a tense escape and the truth behind the fortress.