Adrian Monk is horrified when he learns there's going to be a blue flu in San Francisco. He doesn't understand what the blue flu is--but it sounds terrible. Captain Stottlemeyer explains that it's not really a virus: the police force plan to call in "sick" until they get a better contract. The good news is that the labor dispute will give Monk a chance to get back on the force. The bad news is, it means he'll be a "scab"--and he doesn't like the sound of that, either.