Think of the best twist you’ve ever read or seen. That incredible plot twist that blew you away. A perfectly-executed twist can make your readers scream “Aha” and pull them deeper into the climax of your book. A badly-executed twist, on the other hand, has a tendency to make your readers close the book and never open it again. So how do you do the former?

Put in plenty of foreshadowing. In fact, feel free to foreshadow it too much in the first draft, and...