Who did Tom Smith write stories for? For ______.

Tom Smith was a writer. (11)He wrote stories for magazines. One evening he could not find an end for a story. (12)He sat with his typewriter in front of him, but he had no ideas. (13)So he decided to go to the cinema.
    When he came back, he found that he had had a visitor. Someone had broken ’into his flat. The man had had a drink, smoked several of Tom’s cigarettes--and had read his story. The visitor left Tom a note: (15)"I have read your story and I don’t think much of it. (14) Please read my suggestions and then you can finish it. By the way, I am a thief. I am not going to steal anything tonight. But if you become a successful writer, I will return."