Children's history-based fantasy fiction Capitol Cat & Watch Dog Succulent Sleuths Protect U.S. Botanic Garden is Judge Janice Law's ninth book, and her fourth book detailing the fun Washington D.C. adventures of Capitol Cat and Watch Dog as they work to prevent the theft of a giant Saguaro cactus from the U.S. Botanic Garden with the help of Dee, a junior intern. The trio, with the help of the U.S. Capitol Police, thwart the efforts of would-be thieves just in time to save the cactus.