Survaine - Gen-Heirs: The Guardians of Sziveria, #6

He made her promise to wait for him.Years after convincing a mysterious young woman not to jump from a bridge, Caidon Survaine receives shadowy orders to eliminate her. Suspicious of the command, he returns home to find a nefarious group has infiltrated the depths of the Sziverian government. No one can be trusted. Guardians meant to protect have been coerced or corrupted. And the young woman he saved is in more danger than she could realize.
Caidon has plans of his own where she's concerned. Doing the right thing always seems to leave Ramsey Hunter in peril. Yet, she can't stop herself from protecting those in need. When she discovers her rare genetic talent can save passengers on a ship destined for trafficking, she ignores her brothers pleas to remain safe at home and embarks on a world adventure with Caidon at her side. She has only one condition for the assassin- he won't deny the passion flaring between them.
Together they navigate new cultures, and their own awakening desires, in a race against the ice flows. If they can't reach the ports of the violent nation of Mark Inland before the last of the thaw, hundreds of lives will be at stake.