Catalina Cat Duran is not thrilled about a class trip to the recycling center. It sounds like the worst field trip ever, until the students arrive and discover that the plant has been sabotaged. Suddenly, sorting bottles and learning about waste become part of a real mystery. Cat and her friends have to look for clues, think through what they know, and find out who would want to stop the recycling center from doing its job. The case turns a practical science topic into something urgent, giving Cat a reason to pay attention to every detail. This chapter book turns an everyday environmental topic into an energetic detective story. It is a good fit for young readers who like school mysteries, friendship, problem solving, and stories where taking care of the planet becomes part of the adventure. The recycling center setting keeps the science connection concrete and easy to understand.