In the Canadian mountains, a trapper goes on the run accused of a crime and is pursued by a rugged and determined lawman of the Royal North-West Mounted Police.

A World War I widow loses her only child and spends the rest of her life as a children's nurse.

A secret service agent falls in love with an illegal immigrant.

Lin McAdam rides into town on the trail of Dutch Henry Brown, only to find himself in a shooting competition against him. McAdam wins the prize, a one-in-a-thousand Winchester rifle, but Dutch steals it and leaves town. McAdam follows, intent on settling his old quarrel, while the rifle keeps changing hands and touching a number of lives.