Former French diplomat François de la Conche comes out of retirement to serve his country just to make a simple trade-off in London with a Russian arms dealer. But aristocratic François has no idea the hypodermic gun he'll pick up contains an ingenious but deadly microchip. He also isn't prepared for a nightmarish collaboration with charming but opportunistic interpreter Jean-Pierre Moindrau. When François accidentally injects the chip into Jean-Pierre's body, the interpreter becomes a walking time bomb set to explode in 12 hours ! The unlikely duo face a series of dangerous traps all around London as they're pursued by Taiwanese to terrorists, Scotland Yard and the French militar. They're forced to stick together, but it's no "entente cordiale".