The Dark Moon(Atrophy‪)‬

After his unusual reaction to a weapon, Commando Varean Donnelly is accused of being a shape-shifting alien and imprisoned onboard the Imojenna. Sure, he has abilities he keeps hidden from everyone-including the gorgeous doc examining him-because the government makes sure people as different as him disappear. For good.
Imojenna doctor Kira Sasaki knows there's something different about the handsome commando the captain's thrown in their brig. She doesn't think he's Reidar, although he might have been a victim of their cruel experiments. But when Kira learns the stubborn commando's racial make-up, she finds herself torn between defending him to Captain Rian Sherron and his crew or urging Varean to escape while he still can.
Contains mature themes.