The Psychological genre of books typically explores the inner workings of the human mind and emotions, often delving into complex and sometimes disturbing psychological states. These books may focus on mental illness, trauma, relationships, or personal growth, and often challenge readers to confront their own beliefs and perceptions. Psychological books may be suspenseful, thought-provoking, and emotionally intense, offering readers a deep and often unsettling glimpse into the human psyche.

The "Investigation" category of books typically involves stories that revolve around solving a mystery or crime. These books often feature detectives, private investigators, or other types of sleuths who use their skills and expertise to uncover clues, interview suspects, and ultimately solve the case. The investigation genre can include a wide range of sub-genres, such as police procedurals, cozy mysteries, and psychological thrillers, but all share a common focus on the process of uncovering the truth.

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