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Clive Cussler's books belong to the adventure genre, characterized by thrilling narratives filled with action, suspense, and exploration. His stories typically involve intrepid heroes embarking on perilous journeys to uncover hidden treasures, solve mysteries, or thwart villainous schemes. Cussler's works are known for their fast-paced plots, exotic locales, and intricate details of historical events, captivating readers with a blend of adventure, intrigue, and historical elements.