Four years ago you worked for the CIA. You worked there for a few years; you worked your way to the top with your partner. You worked well together. The last mission you remember was the one where you fell in love. You fell in love with a civilian. They made you smile, they made you laugh, and they made you feel loved. Strangely enough, it happened to both of you. You told the CIA you were out. You wanted out so you could live your life with them. Everyone told you that you shouldn't be with them, you were born in the CIA and should stay there, especially your handler. You never listened though; you got married and settled down. You decided not to have kids for a while though, even though your spouse wanted them, you wanted to make sure you were completely safe for a few years before you got into having a family.

. Now .
Four years ago you got out of the CIA business. You got married. You're happy as could be with your spouse. Even though you and your partner got married, you are still very close. You are always in contact with each other, in fact, you live in the same neighborhood.
Little do you know, your older handler when rouge. They went against the CIA, and they are after you. When you got out, they had people called sleepers place all around you. They were to get close to you and become your friends that way if something ever happened, they could kill you in a snap. Well, your old handler put them into action, and both of you have a bounty over your head, a twenty million dollar for each one of you that is killed, and your spouses are part of that bounty.
When your old handler went rouge, they blamed you both, so this is why you have this bounty on your head. Your goal is to kill your handler, and survive. But this is only going to be a little more difficult with a untrained spouse that you constantly have to protect, train on the run, and handle all their emotions that are freaking out.
[[ I got this idea from the movie The Killers. Just modified it a bit. ]]