My Next Breath by Shannon McKenna

Zade Ryan. Rebel supersoldier. Nearly superhuman. On a desperate quest to rescue his missing brother Luke by any means possible. To do it, he must seduce the elusive Simone Brightman, inventor of the ingenious and deadly tech used to capture Luke and hold him prisoner, location unknown. Zade will do whatever it takes to get close to Simone. Her mysterious beauty and highly sexual allure have him at a disadvantage, but time is running out …

Simone is fighting battles of her own, on her own. Until Zade—six foot four of sinewy muscle and lethal combat skills—rescues her from street thugs and leaves her breathless. His smoldering black eyes and overpowering sensuality—and his seductive invitation to spend one wild, unforgettable night with him—prove too tempting to resist.

Their passionate encounter unleashes scorching desire that neither can control—leaving them vulnerable to their enemies who watch from the shadows and wait. And when they are lured into a trap by a monstrous killer hellbent on their destruction, they must fight with every weapon they have to save Luke, and each other.

Because one night together could never be enough—and they might not live to have another …