Trenton Lee Stewart, first time novelist, takes young audiobook listeners on a mind-blowing adventure that puts friends, family, and foe to the test. Are you up to the challenge? "Are you a gifted child looking for special opportunities?" Dozens of children respond to this peculiar ad in the newspaper and are then put through a series of mind-bending tests, which audiobook listeners take along with them. But only four children--Reynie, Kate, Sticky, and Constance--succeed. Their challenge to go on a secret mission that only the most intelligent and inventive children can complete. To accomplish this mission they must go undercover at the Learning Institute for the Very Enlightened, where the only rule is that there are no rules. But what they find in the hidden labyrinth of the school's underground tunnels is more than your average school supplies.