The secret of the puzzle box
by Penny Warner
Popularity 2
"The members of the Code Busters Club take a class trip to Angel Island--the Ellis Island of the West--where they discover a mysterious box with a connection to one of the Code Busters"--
Mystery and detective storiesCode and cipher storiesDetective and mystery storiesCryptographyJuvenile fictionCiphersFictionChildren's fictionCalifornia, fiction