Levi is a legendary U.S. Marine sniper, maybe the greatest in the world, but he’s retired. The only battles he fights now are the ones in his head, residue from all his kills. Oh, and he’s a poet. This will come in handier than you might think.

You are a Lithuanian assassin working for the Russian government; also great at his job, which means you killed a lot of people (she, too, is a crack shot). You're both are loners, as people with these sorts of jobs tend to be in movies (and probably in real life). What could they talk about at parties? “Oh, hey, Levi, who’d you kill today?”

Neither knows about the other. Yet.

Levi meets with a creepy, powerful woman (Sigourney Weaver, good at this sort of thing), and before you know it, he is posted on one side of a big, deep gorge, with fencing and concertina wire and big weapons and whatever you can think of all over the place. Across the gorge, 600 meters away, there is a similar setup. That’s where you are stationed.

There is no outside communication of any kind except for a monthly radio check-in. No one, including presidents, kings and prime ministers or anyone else, knows about the arrangement. So what are we doing here, Levi asks, trying to keep people from going in the gorge? “No. You need to stop what’s in the gorge from coming out.”

And then Levi and you meet.

At a distance. Long story short: you writes messages on signs to him, he responds, they take turns playfully shooting at each other — hey, it’s what they’re good at — and before you know it, he’s running a line across the gorge to visit. It’s not like anyone will know as long as Levi is back for his monthly check-in. He runs into a bit of trouble when his momentum stops him about halfway over, but he figures out how to go the rest of the way. But it didn't go as planned since there's something dangerous out there and both of you are trying to protect the area,and you end up at his tower place.