Arthur "Artie" MacArthur is a tenacious twelve-year-old with good detective instincts, somewhat questionable judgment, and two very good friends: Jenny Adams-tofu-eating and quick-witted, with a large dose of common sense and a sarcastic wit; and Sam Franklin-bologna-eating, sports-loving, mystery-hating, but always there in a pinch. From Artie and Sam's outrageous sandwich-making contests (the sight and smell of which makes Jenny nauseous), to the...