I'm not sure which novel you're referring to. However, based on the information you provided, I can try to help you find a possible novel title. According to your description, this novel was heard on a radio station seven years ago and then forgotten. If you can provide more details such as the name of the radio program, the frequency of listening, etc., I will be more likely to help you find the name of the novel. At the same time, if you can provide a general plot or a brief description of the novel, I can try to help you narrow down the search.