"This cleverly plotted, engrossing read will appeal to maturing fans of Jon Scieszka’s ‘The Time Warp’ series." — SCHOOL LIBRARY JOURNAL Fresh from a dangerous time-traveling mission, Eli Sands and his friends Clyne, the dinosaur, and Thea, the scholar from Alexandria, are thrown into nineteenth-century America. While Clyne is stranded alone, Thea and Eli pop up at the start of the Lewis and Clark expedition, where Thea is mistaken for a runaway slave. After a close escape, the friends make an unsettling discovery about a Prime Nexus that they may have caused — and which will surely change all of history to come.

Weeks after watching her principal try to chew up her teacher, and minutes after she'd just lost her family, 12-year-old Aurora Bonsall begins her escape. Alongside Max Random in his hand-built go-kart, they set off across a ruined landscape of studio backlots, wrecked shopping malls, and not-so-abandoned hospitals. At every step, they'll find the not-quite-dead waiting for them. As they head for a rendezvous point where Max insists they'll be safe, it becomes clear that surviving humans can be far more dangerous than the Nano-Zs taking over the world. But as Aurora discovers Max has secrets of his own, she wonders if there can ever be any escape at all.