Author:
Warner, Gertrude Chandler, 1890-1979.
Imprint:New York : Scholastic, c1966.
Description128 p. : ill. ; 20 cm.
Note:The Aldens are spending the summer traveling on a train, in their own Caboose #777. They learn that the caboose has a mysterious past involving a circus clown, a high wire artist, and a valuable necklace.