Magic tree house 50 hurry up houdini stepping stone booktm a stepping stone book magic tree house r merlin mission mary pope osborne october 15 mary pope osborne books amazonca. Magic tree house 50 hurry up houdini a stepping stone booktm by osborne mary pope 2013 hardcover mary pope osborne books amazonca. By mary pope osborne magic tree house 50 hurry up houdini unabridged audio cd books amazonca. Magic tree house 50 hurry up houdini by osborne mary pope 2013 audio cd amazonca books. Mary pope osborne is the author of the new york times number one bestselling magic tree house series as well as co author of the magic tree house fact tracker series along with her husband will and her sister natalie pope boyce sal murdocca has illustrated over 200 childrens trade and textbooks he currently teaches childrens illustration at parsons school of design in new york city