Nathan K Series by Stuart Jaffe

Nathan K -- he can hold two souls in his body. If he dies, he loses one yet lives on with the other. As long as he replenishes his second soul, he cannot be killed. Nathan K is immortal. CAUGHT BETWEEN TWO WORLDS When a brilliant hacker calling herself Robin Hood steals proof of a corrupt Senator and hides it away, those who will be exposed go on the warpath after her. Nathan K is her only hope to survive the relentless attacks and escape death... moreNathan K -- he can hold two souls in his body. If he dies, he loses one yet lives on with the other. As long as he replenishes his second soul, he cannot be killed. Nathan K is immortal. CAUGHT BETWEEN TWO WORLDS When a brilliant hacker calling herself Robin Hood steals proof of a corrupt Senator and hides it away, those who will be exposed go on the warpath after her. Nathan K is her only hope to survive the relentless attacks and escape death. But helping one mortal woman is not Nathan’s only problem. Roy, a rogue immortal, is determined to change Nathan’s view about helping others. He wants Nathan at his side forever, and that means giving up on the mortal world. Trying to maintain his freedom from the immortal world while saving a life in the mortal world may prove to be more than Nathan can handle. And it may cost him more than his soul. less

Nathan K — he can hold two souls in his body. If he dies, he loses one yet lives on with the other. As long as he replenishes his second soul, he cannot be killed. Nathan K is immortal. AGAINST AN IMMORTAL ARMY After learning how some Immortal groups use mortals as slaves and worse, Nathan can no longer sit by. Yet stopping them means war. To take on the Immortals is no easy task. Especially when they have had endless time to study strategy and tactics... moreNathan K — he can hold two souls in his body. If he dies, he loses one yet lives on with the other. As long as he replenishes his second soul, he cannot be killed. Nathan K is immortal. AGAINST AN IMMORTAL ARMY After learning how some Immortal groups use mortals as slaves and worse, Nathan can no longer sit by. Yet stopping them means war. To take on the Immortals is no easy task. Especially when they have had endless time to study strategy and tactics. Especially because they are willing to let a war stretch out across the shadows year after year for centuries. But they aren’t prepared for Nathan K. He will need allies, luck, and a determined soul in order to survive. A little C4 helps, too. And this is only the beginning... less

Nathan K -- he can hold two souls in his body. If he dies, he loses one yet lives on with the other. As long as he replenishes his second soul, he cannot be killed. Nathan K is immortal. OCEAN OF DEATH When Nathan discovers two informants willing to turn against Larkin, his longtime rival, he has a chance to crack open his enemy’s defenses. But nothing is ever simple for Nathan K. An assassin looking to make her name and a secret organization looking to destroy the Immortals cloud matters... moreNathan K -- he can hold two souls in his body. If he dies, he loses one yet lives on with the other. As long as he replenishes his second soul, he cannot be killed. Nathan K is immortal. OCEAN OF DEATH When Nathan discovers two informants willing to turn against Larkin, his longtime rival, he has a chance to crack open his enemy’s defenses. But nothing is ever simple for Nathan K. An assassin looking to make her name and a secret organization looking to destroy the Immortals cloud matters. Then Nathan’s tech guru inserts herself in the action. That would be difficult enough, but all these warring sides are stuck on a cruise liner in the middle of the Atlantic with nothing but endless ocean surrounding them. And plenty of bullets. less