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"The sipwreck on the lonely islands was exciting enough for the Adventurous Four! But think how they felt when they discovered the hidden harbour ful of enemy submarines! The had to investigate more closely just as they had to get back to the mainland to expose this terrible enemy. But a forgottoen camera leads to their capture. How can they outsmart the enemy and escape? And, even then, is there any way of getting off the island?"
Published 1962 by Mayfair Books. Softcover 160 pages.
PLEASE NOTE: Title Page is loose.
