So, both of them are criminals (obviously) and they are ordered by their boss - can be whoever - to find a certain artifact. They have to search all over the world to find it in a week, or they get punished. But the problem is, they can't get caught by any police or the government, even if they have to break some rules.
*shrugs* lol.
All you need is faith, trust, and a little bit of pixie-dust!