Cascade County, Montana... Middle schoolers Johnel Walker, Tony Walker, and Elliot Green have formed a summer book club. They gather beneath a shady tree twice a week in the Walkers' backyard to read, discuss, and trade the books they've selected. Usually, the club members agree on the chosen books. But when Elliot shows them a crusty, dirt-coated, ancient book he discovered in an abandoned cabin and says it's one they should read next,...