"The Joker's Epitaph"
Joker grabs the document on his way out of his hideout, which legally gives him a position at the bank. He then tries to blackmail Bruce, threatening to make public his knowledge of the embezzlement. When that doesn't work, Joker's assistant announces that she is engaged to Bruce! Batman and Robin then investigate the bank, and Joker tips his hand when he orders his robots to attack. After a very odd examination from Doctor Floyd, Bruce is declared fully sane.
When Commissioner Gordon hears that Bruce is engaged to a criminal, he immediately arranges to have him committed, sending out the 'Anti-Lunatic Squad'.
Robin is about to be reunited with the four-colour strip from whence he came...