The Secret of the Minstrel's Guitar
By: by Carolyn Keene [pseudonym].
Edition: [1st edition]
Series: Dana Girls Mystery Stories #29
Publisher: Grosset & Dunlap
Published: 1967
Place of publication: New York, NY
Language: eng
Format: Hardcover
Number of pages: 174
Subjects: Dana Girls (Fictitious characters) -- Juvenile fiction.; Women detectives -- Juvenile fiction.; Mystery and detective stories.
Genres: Juvenile mystery fiction
Description: The Dana girls take time off from Starhurst School to accompany their Portuguese-American friend Isabel Sarmento and her father to Lisbon, Portugal.  Senhor Sarmento has enlisted the assistance of the teenage sister detectives in solving the baffling thefts of cork products from his Lisbon warehouse.

But even before the ocean liner the Balaska leaves New York Harbor, Jean and Louise find themselves involved in a mystery on shipboard.  What is the secret of the minstrel's magic music?  Why is a thief so eager to get hold of the handsome young man's guitar?  Is the dangerous schemer somehow connected with the warehouse thefts?

Jean and Louise successfully combine sightseeing in beautiful, romantic Portugal with outwitting a tribe of sinister gypsies as they unravel this double mystery.