On Mars, your best friend sometimes turns out to be your worst enemy.Zeke Hailey is struggling with life at the Chasm, the 23rd century school for psychics. His extrasensory skills have dried up and there's a prehistoric robot out to kill him. At least he has a new mate, in the shape of late comer Fitch Crawley. Only there's more to Fitch than Zeke realises. The boy has a genius for hypnosis, making fools of the teachers. Fitch has an invisible pet too, a creature armed with deadly venom.Zeke and Fitch team up with an old foe, setting off on a Martian road trip. But this search for answers will bring them face to face with monsters and, most dangerous of all, a demon from beyond time.Zeke will have to do more than survive his mind-bending friend and the ancient killer robot. As the universe starts to collapse, Zeke must choose between saving his friends or the human race. For nobody but Zeke can stop the apocalypse of Gravity's Eye.