In a cabin high on Twilight Mountain lives old Louis Dorchet and his daughter Clotilde. Their only friend is big, honest Jacques Lennaux, the trapper, who has watched Clotilde grow from childhood to womanhood and has come to love her. One day near a deserted camp Clotilde finds a picture. It is a copy of Watt's "Sir Galahad." She takes it home with her, but neither Jacques nor her father can tell her who the beautiful youth is. She pins it to the wall of the cabin. Near the Dorchet cabin is a high rock which Clotilde has named the place where the sun sets, and she makes a daily pilgrimage there to bid the sun good-bye. Dorchet falls ill and on his bed calls Jacques to him, "Jacques, my friend, marry my little Clotilde that you may care for her." After the marriage the old man dies. Several months later Jacques leaves Clotilde alone while he goes to the settlement to sell his furs. Two strangers come to Twilight, camping out, Dick Kenton and his friend Jim Martin. Clotilde sees Dick standing beside his horse as it drinks, and his pose is the pose of the man in the picture. He rides off without seeing her. The next day Jim meets her and attempts to kiss her. Dick rescues her and Jim slinks off. Dick and Clotilde become friends. She shows him the picture and he tells her that it is Galahad. She wants to know who that is and he takes from his pocket a copy of Sir Thomas Mallory's "Le Morte D'Arthur." And when she saw Sir Galahad ride, she said, "God be with the best knight in the world." Clotilde clasps her hands, "That's you, you," she cries. He gives her the book. When he returns to his camp Jim has gone, leaving a note to the effect that should he stay they would surely come to blows over the "alluring Dryad." Jim makes him way to the settlement. Jacques at the settlement has come upon Pedro, a half-breed, unmercifully beating his pony and has promptly given Pedro a sound thrashing in consequence. Jacques then enters the "hotel." Jim appears on the scene. In the bar he tells of Dick's conquest back on Twilight, a highly-colored account. Jacques fells him to the floor and strides out. He starts back home in his canoe. Jim bribes the willing Pedro to kill Jacques. Pedro makes a short cut on his horse and conceals himself at the spot on the stream where he knows Jacques will land. He springs upon Jacques. Dick and Clotilde have come to love each other, though they have not voiced their love. Dick finds Jacques unconscious. He starts to assist him when the name on the handle of Jacques' hunting knife tells him who the man is that he is befriending. He starts to go away but his better nature asserts itself and he takes Jacques home. Clotilde tells Jacques when he recovers that he owes his life to Dick. Jacques broods over his wrong. He feels that the two young people love each other and, though his code of honor will not let him kill the man who saved his life, he determines to kill Clotilde rather than let her dishonor herself. Dick and Clotilde meet, he makes love to her but she tells him that to her he is Galahad and not to spoil her belief in him. She writes him a note later and slips out of the cabin with it. Jacques follows, his hand on his knife. She leaves the note in the crotch of a fallen tree and Jacques reads it, "Leave Twilight. You and I must never see each other again, for I love you, but I will never desert Jacques, dear, good Jacques, who would die for me." The note and the words, "Who would die for me," have a strange effect on Jacques. He decides what he will do. He leaves a note on Clotilde's pillow, "My little Clotilde, I go to the place where the sun sets. I have a fancy to sleep beneath the stars. Should you wake and miss me, you will find me there, Jacques." At dawn the next morning. Dick, who is leaving Twilight, feeling it the honorable thing to do, comes upon Jacques lying at the foot of the great rock. He is still alive. Dick is horrified. Jacques begs, "Be good to my little Clotilde," and he promises. Clotilde finds them there. Jacques lies like a gentleman he is, and says that he accidentally fell. He dies in her arms. Dick takes the sobbing girl to his breast.