This is a 1941 film noir based on the novel of the same name by Dashiell Hammett.
The story follows a San Francisco private detective and his dealings with three unscrupulous adventurers, all of whom are competing to obtain a jewel-encrusted falcon statuette.
In 1539 the Knight Templars of Malta paid tribute to Charles V of Spain by sending him a Golden Falcon encrusted from beak to claw with rarest jewels.
But pirates seized the galley carrying this priceless token.
The fate of the Maltese Falcon remains a mystery to this day.
It would be much more fascinating if the director looked into this mystery.