From New York Times bestselling author Toni Anderson comes a heart-wrenching, emotional story about love, bioweapons, and the importance of keeping promises.

In the midst of wedding preparations, a shadowy figure from Alex Parker's past reappears and threatens the joy he's found with Mallory Rooney. Four years ago, Jane Sanders's powerful ex-husband kidnapped their young daughter and Jane hasn't seen her since. Now, she finally has a lead and she knows just the man to help get her daughter back. Trouble is, he's an assassin. And he terrifies her.Despite his upcoming nuptials, Alex agrees to help, but it doesn't take long for the routine operation to turn complicated-and deadly on a global scale. Can the former assassin make it home in time to marry the woman he loves, or will his dark past destroy all hope for their future?

A Cold Dark Promise takes place during the week leading up to the wedding of former CIA assassin Alex Parker to FBI Agent Mallory Rooney, who first meet in the novel, A Cold Dark Place. A Cold Dark Promise can be read as a standalone novella, but readers might get more enjoyment if they read A Cold Dark Place first.