To help me find the right book, could you please provide more information, such as:
* The author's full name: Is it Frederik Pohl? Or is it a different author with a similar name?
* The genre of the book: Is it science fiction, fantasy, historical fiction, etc.?
* Any other details about the book: Do you remember any characters, plot points, or the time period it was set in?
Once I have more information, I can help you find the correct ISBN.