"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.

"Readers will revel in the fractured time line, as well as in Eli’s ruminations on relativity, unintended consequences of technology, and quantum flux." — SCHOOL LIBRARY JOURNAL After another close call, Eli Sands, aka Danger Boy, is back in San Francisco in 2020. The bad news is that he and his friends, Clyne and Thea, are being held captive by the government agency DARPA. Since their last foray into the Fifth Dimension, history has been unraveling, the deadly slow pox is spreading fast, and DARPA wants to send Eli back in time to ancient Jerusalem. But Eli and crew discover a city in ruins from a Babylonian invasion and an angry mob ready to stone them. Will Danger Boy and company ever find their way home again?