S1·E12 Jacob Two-Two and the Ghost

Jacob discovers that he has a ghostly roommate named Claude LaToque, a former coureur de bois. A friendship quickly develops, but soon, Jacob learns that Claude is hiding a shameful secret about his past, which he doesn't want Jacob to know lest their friendship come to an end. As he tries to learn the truth, Jacob finds himself transported back in time to a lonely trading post on the night that the terrible event took place. Jacob's trust in Claude is not misplaced, and as he learns what really happened that fateful night, he also redeems the tarnished reputation of his ghostly friend.