Gertrude Warner

 Gertrude Warner 's Books

A very well recieved series by Gertrude Warner are the books, featuring tropes. The most popular books are Mystery in the Sand, Blue Bay Mystery, The Woodshed Mystery, Mystery Behind the Wall, Bus Station Mystery, Mystery Ranch, Snowbound Mystery, Bicycle Mystery, Tree House Mystery, The Yellow House Mystery, The Boxcar Children Mysteries Box Set, The Boxcar Children, Surprise Island, which was published in 2022.