Item Details:

• Titles: 11. While the Clock Ticked (1962), 12. Footprints Under the Window (1965), 13. The Mark on the Door (1967), 14. The Hidden Harbor Mystery (1961), 15. The Sinister Signpost (1968), 16. A Figure in Hiding (1965), 17. The Secret Warning (1966)
• Author:Franklin W. Dixon
• Publisher:Grosset & Dunlap Publishers
• Copyright: 1959-1966
• Edition: Unstated

Condition:

• Books are in mostly good condition
• Books 15 and 17 are in acceptable condition
  • Book 17 has marked crease with bump across the leading edge of back cover
  • Both books have rubbing to covers and staining at edge of text block; readability unaffected
• Some wear to corners and spine ends with lights scuffing (see photo)
• Tops of text blocks are dyed black with some soiling to other text block edges
• Black and white multi-scene endpapers