Naval Commander Nathan Harper will pay any ransom for his sister, Emma. But the kidnapper’s demand is more than he bargained for – a secret formula linked to Megan Foster, the woman who destroyed his family.

Megan carries the guilt for Emma’s abduction, and so much more. She’s determined to find her, even though it means enduring Nate’s contempt.

Together they embark on a race against the clock, nature, and shadowy enemies. When forced to choose will Nate protect his heart or surrender to the woman who threatens to invade it?