“Fasten your seat belt. This is one wild ride.” —Kirkus (starred review)

A road trip for answers. A journey into danger.

Penny is a genius—a rare savant with a photographic memory and a mind that never forgets. But even with all her brilliance, one mystery remains unsolved: why did her father disappear while she was in a coma at age seven, and where has he been since?

On her 21st birthday, everything changes. The usual card from her estranged father arrives—except this time, it includes a return address. And a goodbye.

For the first time, Penny leaves the safety of her mother’s home and specialized school behind, setting off on a journey to find the man who left her behind. But as she ventures into a world she’s never known, she soon realizes that solving the puzzle of her past might come at a deadly cost.

Brilliant mind. Unanswered questions. And no turning back.