The "Crime" category of books typically includes stories that revolve around criminal activities, investigations, and the pursuit of justice. These books may feature detectives, police officers, or other law enforcement officials as main characters, as well as criminals and their victims. Crime novels often involve suspenseful plot twists and turns, as well as complex character development. The genre can encompass a wide range of subgenres, including mystery, thriller, and true crime, and may explore themes such as morality, ethics, and the human condition. Overall, the "Crime" category offers readers a thrilling and engaging look into the darker side of human nature and the justice system.

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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