Enid Blyton: The Famous Five - Five Go Down To The Sea

I bet the Wreckers' secret way is used by someone who steals down to the cove and takes the smuggled good!' The famous five have planned a holiday filled with swimming and picnics on the Cornish coast. The one day, they hear of an old plot to wreck ships down on the rock - and it seems to have started again! Can the five discover who is flashing lights from the tower on stormy nights, and save the boats from being robbed?