Causality doesn't always flow in a straight line... Tharsis has done the incredible: she has thrown herself across time and space, escaping certain death in the void. Only problem is, she dove a little too far. The icy wastes of Noqumiut may be behind her, but she's further than ever from home. Caleb Ross has always considered himself an unremarkable guy. Waking up centuries in the future was shock enough. Being told he's in charge of a planet? That's beyond absurd. Binding them together is a mystery, eight hundred years in the making. The Flet is missing, and with him, the FTL capacity of the entire Heliosphere. His captors plan on using him to reignite one of the nightmare engines of old Earth, a technology that can rewrite reality itself. Now, both Tharsis and Caleb must fight their way through unfamiliar worlds, to reach the Flet and pull him out, before spacetime unravels. But as the wall between past and present crumbles, the task may prove impossible.