Someone wants Mackenzie Stone dead.

After four attempts on her life, the Stone Foundation hires her a bodyguard - Diego Lopez, the man who'd thwarted the most recent attack.

Mackenzie suspects the threat is coming from inside her organization, so Diego poses as a college friend researching foundations. Their 24/7 forced proximity only intensifies the attraction simmering between them.

As their need for each other begins boiling over, they struggle to focus on the growing threat. And when they visit Diego's family for Christmas, Mackenzie is torn by conflicting emotions – celebrating the holiday she hates while fighting her need for Diego.

As the threats spiral out of control, Mackenzie is backed into a corner. Can they unravel the mystery of the attacks before the shadowy danger engulfs them both?