The beginning is intriguing and has a lot of nice touches to it that could make a fan smile. There's Kogoro's crush on Yoko Okino. There's a flashback to when Ran and Shinichi were kids. There's Ran just being a nice person in her community. But then the mystery intrudes and it's so terribly thin. To call it a mystery is an overstatement. It's just something mysterious that unceremoniously resolves itself when Conan and Heiji get involved. The way that they address the situation requires them to forget about one of Conan's most-frequently used gadgets until the very end, and there's no clever sleuthing involved at all.
Everything else about it is standard for a forgettable episode of the show, so it's not terrible. But it was a bait-and-switch and not a good one.
