By the Law (movie, 1926)

A five-person team of gold prospectors in the Yukon has just begun to enjoy great success when one of the members snaps, and suddenly kills two of the others. The two survivors, a husband and wife, subdue the killer but are then faced with an agonizing dilemma. With no chance of turning him over to the authorities for many weeks, they must decide whether to exact justice themselves or to risk trying to keep him restrained until they can return to civilization.