The Maltese Falcon
Peter Lorre's villain is explicitly gay in the novel, but to pass the censors in the iconic 1941 adaptation, the character's queerness manifests in subtler ways--like gardenia cologne and suggestively stroking a cane, though audiences at the time would likely catch the hint.
A private detective takes on a case that involves him with three eccentric criminals, a beautiful liar, and their quest for a priceless statuette.