After developing supernatural powers, an orphaned teenager escapes her harsh life in the subway tunnels only to find herself in a mysterious school where she must protect extraterrestrial gemstones containing technology powerful enough to control the world. Using her newfound powers and the skills she honed while living in the tunnels, Trista and her new friends must race against time to find the Sky Gems before those with darkness in their hearts use the alien technology inside them to wreak havoc on the world. In this suspenseful young adult thriller, Trista struggles to stay alive when she discovers the darkness wants her dead.