Suspense books are a genre of literature that involves complex narrative structures, plot twists, and high levels of tension to keep the reader on the edge of their seat. This category often intertwines with other genres like adult mystery, where the plot revolves around solving a particular enigma or crime, and mystery science fiction, where futuristic or extra-terrestrial elements are woven into the suspenseful storyline. These books are typically characterized by a thrilling, fast-paced plot, dramatic tension, unexpected turns, and a sense of impending doom, aiming to evoke feelings of excitement, fear, surprise, anticipation, and anxiety in the reader.