True North — L.E. Sterling

Abandoned by her family in Plague-ridden Dominion City, eighteen-year-old Lucy Fox has no choice but to rely upon the kindness of the True Borns, a renegade group of genetically enhanced humans, to save her twin sister, Margot. But Nolan Storm, their mysterious leader, has his own agenda. When Storm backtracks on his promise to rescue Margot, Lucy takes her fate into her own hands and sets off for Russia with her True Born bodyguard and maybe-something-more, the lethal yet beautiful Jared Price. In Russia, there's been whispered rumors of Plague Cure.

While Lucy fights her magnetic attraction to Jared, anxious that his loyalty to Storm will hurt her chances of finding her sister, they quickly discover that not all is as it appears…and discovering the secrets contained in the Fox sisters' blood before they wind up dead is just the beginning.

As they say in Dominion, sometimes it's not you…it's your DNA.