Eleven-year-old Gilly has been stuck in more foster families than she can remember, and she's disliked them all. She has a county-wide reputation for being brash, brilliant, and completely unmanageable. So when she's sent to live with the Trotters -- by far the strangest family yet -- Gilly decides to put her sharp mind to work. Before long she's devised an elaborate scheme to get her real mother to come rescue her. But the rescue doesn't work out, and the great Gilly Hopkins is left thinking that maybe life with the Trotters wasn't so bad ...