Set in the early 20th century, the film follows a game warden who arrives in Florida to enforce conservation laws. He soon finds himself pitted against Cottonmouth, the leader of a fierce group of bird poachers.

Terry Malloy is a kindhearted dockworker, and former boxer, who is tricked by his corrupt bosses into leading his friend to death. After falling in love, he tries to leave the waterfront and expose his employers.