Light Over Lundy

"The Tamlyn family, on holiday in Devon, notice strangely irregular flashes from the lighthouses at Hartland and Bull Point. Stephen Tamlyn is riding on the sands the next day, when his horse shies at a bottle, which proves to contain a mysterious message. He encounters a stranger, who offers to decipher the message and who subsequently invites the children to a picnic. During luncheon they see an aeroplane drop something shining on the beach, and by now it is apparent that there are sinister goings on in this quiet corner of the coast. The investigation of these happenings lands the Tamlyn family and their ally, Mr. Prosper, in the most exciting holiday, described by Mr. Mais with unflagging gusto and with intimate knowledge of the West country and it's people.