A novelist takes his family on a vacation in the mountains, but when they arrive, they see a strange series of lights in the sky and hear some disturbing noises. They quickly decide to return to the city, but at Christmas they venture to the country home again. The novelist has been suffering from depression and writer's block, and when he returns to the cabin, he thinks that eerie things are happening to his body. His family believe he is having hallucinations, and convince him to see a psychiatrist. With the help of hypnosis, the psychiatrist uncovers the haunting experience the writer underwent with aliens from another planet.