The Unwritten Law is a 1932 American pre-Code mystery film directed by Christy Cabanne and starring Greta Nissen, Richard "Skeets" Gallagher, and Mary Brian. It was distributed by the independent Majestic Pictures.
A film crew board a liner to head overseas for some location shooting. While on board the film's producer is murdered, with many different members of the cast and crew having motives to kill him.