Third grader Justin Case gets this nickname thanks to his amazing ability to worry about everything. His journal chronicles his nightmares and self-fulfilling prophecies of doom. He carries concerns about school, sports and friendships to wild extremes, and he creates a litany of characters and events that strike terror at every turn, from the imaginary robber Big Boy to his beloved stuffed animals, which wage a war over control of his bed, to the boiler at the way back of the basement—and anything else his incredibly active and freewheeling imagination can conjure. For him “there’s always tomorrow for all the bad things that didn’t happen today.” He doesn’t notice that he is also kind, dependable, tenacious and highly creative, as well as a very good friend and big brother. Vail employs easy, direct language in a rhythm and syntax that captures the essence of a charming, lovable and very believable boy. Readers transitioning to longer fiction will groan, sympathize and laugh out loud in delight. Absolutely marvelous. (Fiction. 7-10)