As an FBI agent, I've seen a lot of evil. But I've never seen anything like this. A serial killer whose victims have nothing in common, who covers the crime scenes in equations even our best people can't solve. Only one person can help: a mysterious, reclusive genius. When I track her down, her fragile beauty and amazing mind take my breath away. All she wants is to be left alone but to catch the killer, I have to drag her back into the world. As we work together, something starts to happen. I don't have friends. But she starts to feel like a friend. I don't have a partner. But she starts to feel like a partner. I don't fall in love. Not after what happened. But.... I look into her eyes...and I can't look away. I glance down at her lips and I find myself leaning forward. There's a soul-deep longing neither of us can fight. We might be the only people who can fix each other. But I have to resist. If she knew the secret I'm hiding.... When the case turns dangerous, all I want to do is protect her. But she's as stubborn as I am. She's the bravest person I've ever met. And she leaves me no choice. This case could destroy us both but the only way we're solving it...is together.