Ground Training - Immortal Outcasts, #5

Former Immortal Operative Ace Hargraves is a genetically altered super soldier shapeshifter who has spent twenty-five years trying to atone for his past sins. It's high time he learns to stop living in the past and with regrets. But when Ace finds himself standing before someone whom he believed to be dead and gone, his entire world shifts on its axis. Now it's all he can do to wrap his mind around the fact she's not only alive but is his mate, not to mention the enemy is anything but gone.