When Rigg and his close friends crossed the Wall between the only world they knew and a world they cannot imagine, he hoped he was leading them to safety. However the dangers with this fresh wallfold are more difficult to see. Rigg, Umbo, and Param understand that they can not trust the expendable, Vadesh – a machine shaped like a human, intended to deceive – however they are no longer certain that they can actually trust one another. But they will have small choice. Because although Rigg can decipher the paths of the past, he can’t however see the horror that is situated ahead: A harmful force with fatal intentions can be hurtling toward Backyard. If Rigg, Umbo, and Param can’t interact to alter days gone by, there will be no future.