Mack MacAvoy, a 12-year-old boy, is told he is one of the Magnificent Twelve who must save the world. Teddy realizes the new friends he made in his remote desert town all disappeared decades ago and a giant sycamore tree is somehow responsible. Kat schemes her way into boarding school to escape her family of thieves but is forced to recover stolen paintings to save her father. Chase discovers two kidnapped boys and gets caught up in a dangerous adventure to save them. Theodore Boone, a 13-year-old who knows everyone at the courthouse, finds himself involved in a murder trial because of knowledge he has of a cold-blooded killer.