After the War of the Words competition forever alters the afterlife, siblings Milton and Marlo Fauster are separated and whisked away to the deepest bowels of the underworld. Guilt-ridden, Milton agrees to work for Principal Bubb in hopes that he can locate his sister and somehow free her. But his nefarious mission--to "character assassinate" the reigning vice principal of Sadia: Where the Really Mean Kids Go--runs afoul when he learns the true identity of this mysterious individual. Meanwhile, Marlo wakes up to teenage paradise that may or may not be what it seems. There's also a mutiny brewing in Heaven while the underworld is turned into a tourist destination for the living. Can Milton follow through with his mission: navigating a nest of history's cruelest tyrants in the process? Can Marlo hold on to her identity amidst a nuclear self-esteem assault? Will they discover the secret history of Sadia before it is potentially used as a weapon against none other than the Big Guy Upstairs?