Fandom: M7 ATF & Leverage
Ezra is undercover and runs into Sophie, who is an old 'friend' of Maude's. Sophie's gang is trying to bring down the same guy the ATF is. Sophie and Ezra decide to join forces - without any sort of consultation with their respective teams.
This one is going to get further thought. Don't know if I can write Leverage though, or sneaky cons and doublecrosses.