The Mystery genre is a category of books that typically involves a crime, puzzle, or enigma that needs to be solved by the protagonist or a group of characters. These books often feature suspenseful and thrilling plotlines, with unexpected twists and turns that keep readers engaged and guessing until the very end. Mystery novels can range from cozy mysteries, which are lighter and more lighthearted, to hard-boiled detective stories, which are darker and more gritty. Overall, the Mystery genre is a popular and diverse category of books that appeals to readers who enjoy solving puzzles and uncovering secrets.

The category of "Time travel" books typically involves stories where characters travel through time, either intentionally or accidentally, to different eras or periods in history. These books often explore the consequences of altering the past or future, and the challenges and dangers that come with navigating different time periods. Time travel books can span a variety of genres, including science fiction, historical fiction, romance, and adventure, and offer readers a unique perspective on the possibilities and complexities of time travel.

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