The "Police" category of books typically refers to stories that revolve around law enforcement officers and their work in solving crimes and maintaining order in society. These books may feature detectives, police officers, or other law enforcement professionals as main characters, and often involve investigations, interrogations, and other police procedures. The genre may include both fiction and non-fiction works, and can range from gritty crime thrillers to more lighthearted police procedurals. Overall, the "Police" category offers readers a glimpse into the world of law enforcement and the challenges faced by those who work to uphold the law.

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.

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