Kid summoned Cronson, so he could help catch another criminal. Cronson joined forces with the criminal instead, and aimed to start a grand crime spree with him. They were stopped by Kid and Mr. Keeper. Cronson accidentally electrocuted himself, and returned to Eternity.
TRIVIA
Though Kid summons historical persons who are not fictitious, Cronson seems to be made-up.
This may be due to the writer misremembering some non-fictional criminals name.