Celebrated author/illustrator Marc Brown revisits his beloved bestselling character in the first new Arthur picture book in almost ten years! Arthur comes home from school and begins sneaking around the house, taking notes and talking about a Big Green Machine. D.W. is suspicious of her brother's weird behavior, but when Arthur shows up late for dinner with green hands, she really gets the creeps! Will the Big Green Machine get her too? Just in time for Earth Day, this heartwarming story will be printed on recycled paper.