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 "Spy" category of books typically involves stories of espionage, covert operations, and intelligence gathering. These books often feature protagonists who are highly skilled and trained in the art of espionage, and who work for various government agencies or private organizations. The plots are often complex and involve intricate schemes and high-stakes missions, with the threat of danger and betrayal always looming. Spy books can be set in various time periods and locations, and can range from action-packed thrillers to more cerebral and nuanced stories of espionage.

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