For brothers Daniel and John Anderson, proving they’re responsible enough for a dog was supposed to be about chores and promises. But when their elderly neighbor’s beloved cat, Whiskers, vanishes, they get their chance in a way they never expected. Transforming themselves into the “Anderson Brothers Mysteries,” the duo launches a full-scale investigation. With a notebook for clues and a hand-drawn map of the neighborhood, they follow a trail that leads from curious clues to a shocking pattern of disappearances. Their quest to prove their responsibility plunges them into a real mystery, where a reclusive neighbor might be a villain, a white van holds a sinister secret, and the truth is far more complex—and dangerous—than they ever imagined.