Gilda is just like Casablanca if Casablanca had a happy ending, which would have been a bad idea even if it hadn’t been already done two years earlier in To Have and Have Not (which at least had Bogie in it). Like Casablanca, Gilda revolves around a love triangle set in a gambling establishment in an exotic location, but while Casablanca...

"Johnny" (Glenn Ford) is quite a streetwise gambler who finds himself rescued amidst the Buenos Aires docks by a suave stranger whose cane comes with a rather lethal optional extra. He suggests that he try his luck at a casino and when he manages to fleece the dealer of a modest fortune, discovers that it's owned by his erstwhile benefactor...