"Batman Displays His Knowledge"
Batman and Robin stay to help reassure the confused students, which allows Catwoman time to steal the opals. She takes them to French Freddy Touché, but he says they're too hot to fence. And they soon realize that Catwoman was tricked, Batman switched the real opals with fakes before this all started.
Batman is ready to accept Catwoman as his partner when she says she wants to spend her life with him. Then she suggests killing Robin (painlessly), saying he's such a bore with his 'holy' this and 'holy' that.
Splashed with acid from a giant coffee pot? Hasn't this one been done to death?