Underland

Long ago monsters and immortals retreated below ground to seek shelter and survive before they were forgotten for eternity. But what do the gods do when they're bored? They bring back the Olympic games, but these games are different. They're bigger and deadlier and the newest contender is a young human girl stolen from the streets above. It's kill or be killed as Kira Lier races against beasts she thought were just myths, to cross the finish line and get a chance to earn her freedom.