Orange boards: cover & spine.
Publisher: Harold Hill
First Printed: 1957
Story version: Original text
-- The frontispiece for this release is brand new (the 1947 US edition omitted one). The artist responsible appears to be Frank Varty.
-- Harold Hill were the only publisher to release this title in the UK. Why exactly Collins and Armada Books chose not to publish this title is unknown (although some G&D Nancy Drew titles were also omitted by Collins, indicating that this anomaly wasn't unique to the Hardy Boys series).
-- The title of this book was Anglicised for a British audience, with the spelling of the word 'Harbor' in the original title changed to 'Harbour'.
-- To view the Harold Hill preview for this title (which appeared on the reverse side of the dust-jacket for The Mark on the Door), please click here.