As authors, we are always looking for ways to intrigue our readers and keep them coming back for more, even if it means to compel a "re-read". I cannot speak for any other author, but I, myself, would consider that to be the ultimate compliment.

So, as a reader, what makes you re-read a book? Is it the compelling story line, the colorful characters, the ingenious plot twist at the end, or just plain boredom?