Edgar Allan Poe's Lighthouse Keeper

A castaway awakes on a beach with wounded forehead and sees a woman leaving the place. He takes his satchel and follows her. While climbing a cliff, he falls and faints. He wakes up with amnesia in a lighthouse and the keeper Walsh explains that they are isolated in a remote peninsula where nobody can leave. The only means of transportation to San Francisco is a ferry that will arrive two weeks later. Last but not the least, he warns that he shall always keep a light burning during the night. He goes to the woods in the morning and meets the woman again. He learns that her name is Nora and they fall in love with each other. When he returns to the lighthouse, Nora explains that Walsh is crazy and she cannot go there. During the night, the young man blows out the candle and sees spectral creatures. What are the secrets of Walsh, Nora and the lighthouse?