It hasn't, and that's what made it good. They threw in side-cases from time to time, because that's what being a private detective would be like, but every episode furthered the "game". That one didn't. At all. They'd obviously decided they wanted to make an over-long, big deal about the wedding, and thought "shit, we'd better put some kind of case to solve in here."
The wedding scene should have been about 15 minutes in a proper episode. Not an episode to itself. Throughout most of it I left the room to do other things, it was that boring. Turns out I missed nothing too.
Episodes 1 and 2 of this series were pure filler. Three was what the series was all about and they could have told the entire story by just extending that by half an hour.
I may still buy the series on DVD when it's cheap, seeing as I already have both of the others, but I doubt I'll ever watch episodes 3.1 and 3.2 again. There'd be no point.