Eighteen-year-old Tally is absolutely sure of everything: her genius, the love of her adoptive family, the loyalty of her best friend, Shane, and her future career as a Nobel prize-winning astronomer. There's no room in her tidy world for heartbreak or uncertainty—or the charismatic, troubled mother who abandoned her soon after she was born. But when a sudden discovery upends her fiercely ordered world, Tally sets out on an unexpected quest
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