Zane by Charissa Gracyk

She was the one who got away and broke his heart. Now, fate is giving them a second chance, but a vengeful enemy has different plans…

Computer expert Zane “Banshee” Hawkins is part of Ex Nihilo, an elite black ops team. They’ve made it their mission to hunt down and eliminate an evil group known as The Agency. Zane might be a cocky SOB, but when he gets hacked by the enemy, he’s humble enough to admit there’s only one person more talented than him when it comes to a keyboard—River Larsen, his fake ex-wife. Pretending to be a married couple so they could infiltrate a terrorist ring had been the easy part. Watching River walk away after he’d suggested they continue seeing each other? Sheer torture.
When River Larsen answers an unknown call, the last thing she expects to hear is Zane’s deep voice. Especially since she thought he was dead. But Zane’s working deep undercover and needs her help. A firm believer that everything happens for a reason, she goes to him, despite the fact leaving him before had been the hardest thing she’d ever done…until she’d tried to forget him.
Although it’s been five years, the tension and sizzling attraction between them is stronger than ever. Zane is certain they belong together, but River’s cautious, tough-as-nails persona makes her wary. She’s a control freak, and being with Zane? Well, he makes her feel everything but in control.
To take down The Agency, Zane and River find themselves working together once again. But the moment she decides to take a chance with him, a dangerous enemy strikes with a vengeance. The stakes have never been higher and with everything on the line, Zane must work fast or lose the woman he loves forever.