Title: The case of the U.S. Navy adventure
Description: Mary Kate and Ashley investigate a mysterious ca;; about a flying saucer that has landed on earth.
Subjects: Juvenile fiction, Fiction, Twins, Flying saucer, Detective and mystery stories, Children's fiction, United states, armed forces, fiction, Olsen twins (fictitious characters), fiction, Mystery and detective stories, Twins, fiction, Unidentified flying objects, fiction
People: Ashley Olsen (1986-), Mary-Kate Olsen (1986-)