The Screwtape Letters
C. S. Lewis
This book is kind of hard to find any foreshadowing. It is about a demon writing to his nephew, an apprentice demon. The uncle is trying to teach his nephew how to manipulate a human (the patient) into commiting sins and bringing them to Hell. Recently the patient converted to Christianity but has been laxing in his faith. I think eventually he will fall away from the Church because others will persuade him to. This isn't really obvious, it is just a guess. The reader doesn't know what will happen, but the Uncle is good at reading the humans actions and predicting what they will do. Another foreshadowing example would be that I don't think this particular patient will be sent to Hell. Once again this is just a guess (the author didn't leave many hints), but I think this because this book seems so dark and sad that there has to be a happy ending. I don't think any of the characters or the reader will see the signs until the end of the book.