The mark on the door /
by Franklin W. Dixon.
- New York : Grosset & Dunlap, [1967].
- 175 p. illus. 20 cm.
- His Hardy boys mystery stories ; [13] .
- Dixon, Franklin W. Hardy boys mystery stories ; 13 ; 13. .
The search for a stolen boat leads the Hardy brothers to Mexico where they become involved with a band of Indians and a strange smuggling operation.