"He builds the most unhackable vaults in the world. She is the only one who can walk through his heartbeat."

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Julian Charles is an architect of secrecy. In the Jurong bedrock of Singapore, he has completed his masterpiece: The Absolute Zero. It is a sovereign vault that requires no keys or codes. Instead, it recognizes only Julian, his vascular signature, his unique gait, and his resting heart rate of fifty-four beats per minute and his DNA mutation.

But Julian is carrying a secret far more fragile than the wealth he protects. He is dying of a rare neurological condition, and he is managing the tremors in total isolation.

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Josephine Charles, a disgraced Olympic gymnast just released from prison, has spent five years in a cell studying her brother’s creation. She knows his vulnerabilities because they are her own. She shares his blood, his history, and the same progressive disease that is stealing her motor control.

To reach Julian, Josephine must perform one final, impossible routine: a three-hundred-meter crossing in a tropical storm and a walk through a vault floor that reads her very soul. In a high-stakes heist where the only prize is the truth, Josephine will prove that no matter how deep you bury a secret, family always finds the cracks.