They both worked as top agents in the spy network. Naturally, they knew each other. (features FemAlex)

Alex knew everything about the inner workings of the world. After being thrust back into the game of spies and assassins, he is damn near the best agent in the free world. But, he's about to find out that there's a whole world that he knows nothing about, one with gods, monsters, super-soldiers, and techno-marvels. And if he's going to survive, he'll have to (re)learn how to adapt.