After a visiting the library to search for new adventure ideas, Miguel and Clarke go on a trip that is out of this world.

"From the Pulitzer Prize-winning author of perhaps the most bestselling and beloved literary fiction of our time comes a triumph of imagination and compassion, a soaring novel about children on the cusp of adulthood in a broken world, who find resilience, hope, and story. The heroes of Cloud Cuckoo Land are children trying to figure out the world around them, and to survive. In the besieged city of Constantinople in 1453, in a public library in Lakeport,...

Despite the evil Locke, Cleo and Evan manage to get Gabriel back to his world, but it is a world that is controlled by a computer network which is connected by a device called a Neuro-Zip implanted in the skull of every human being in the world--every human except for Cleo and Evan, so it is up to them to bring down the Network, and return control to the human population.

When Evan and Cleo sneak into the enchanted library at night they find that Locke has already forced his way into a book, and when they follow they find themselves in a plane that promptly crashes into the Amazon rainforest--and with the help of a boy named Gabriel, (and a friendly sloth) they have to survive the jungle and find the golden statue that is the next treasure in their quest before Locke gets his hands on it.