Magic Tree House

1. Hurry up, Houdini (Magic Tree House #50)Mary Pope OsborneOsborne

   H

   Book 50

   Hurry up, Houdini (Magic Tree House #50)

   Mary Pope Osborne

2. Shadow of the Shark (Magic Tree House #53)Mary Pope OsborneOsborne

   S

   Book 53

   Shadow of the Shark (Magic Tree House #53)

   Mary Pope Osborne

Book data and covers from Open Library (openlibrary.org).