In Dangerous Conspiracy, Stacy has won a free trip for herself and her friends on a cruise ship! The Triple Nine Sleuths are looking forward to a carefree holiday after their year-end examinations but find themselves in the middle of exceedingly puzzling incidents. With an expensive necklace stolen and a man overboard, Corey, Colton and Stacy race to uncover the truth on board a ship where things are not always as they seem.