When John Lowery, his wife Mary and their small son Billy journey to a Northern lumber camp to visit its owner, Clifford Beresford, Mary becomes infatuated with the lumberman and neglects her little boy. A Hudson Bay Company clerk named Nan McDonald, known as the "angel of the lumberjacks," forms such a strong attachment to the child that although he becomes seriously ill, Billy refuses to take his medicine unless Nan dispenses it. Watching over him late one night, Nan sees Mary steal from her room to keep a midnight appointment with Clifford, but when Mary falls down the stairs to her death, Nan maintains her silence for John's sake. Heartbroken, John asks Nan to return with him to the East as Billy's governess, but local gossips misinterpret her presence in John's house and he marries her.