Forbidden River by Brynn Kelly

At the end of the earth, they’ll play a dangerous game… French Foreign Legionnaire Cody Castillo—“Texas” to his fellow commandos—is an adrenalin-junkie. Chasing deadly thrills is his only reprieve from a bloodstained past he can’t forget. But when he finds himself caught in a mass murderer’s crosshairs in the lonely wilds of New Zealand, he finds an unexpected and intriguing ally. Ex-air force pilot Tia Kupa has always found safety in nature, until a killer turns the wilderness into a playground. In this life-or-death game, the guarded woman who lives by the rules must rely on a risk taker with a death wish. The sexy devil-may-care legionnaire may be the wrong guy for her, but desire is just as primal as terror. Even if they outrun a predator, they can’t escape the sizzling bond neither of them saw coming.