Hardcover, 177 pages
English language
Published Jan. 5, 1970 by Grosset & Dunlap.
Hardcover, 177 pages
English language
Published Jan. 5, 1970 by Grosset & Dunlap.
After the new hydrofoil they are guarding is stolen, the Hardy boys face frequent danger in solving a mystery involving criminals who operate by signs of the zodiac.