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Fenton Hardy was still missing when the summer vacation began.
There had been no word from him. Never, in all his years of detective work, had he vanished from home so completely and for such a length of time. He was an intensely considerate man and his first thought was always for his wife and boys. Occasionally it was necessary for him to leave home suddenly on trips that would keep him away for some length of time, sometimes it seemed wiser to keep the knowledge of his whereabouts to himself. But he always managed to communicate with Mrs. Hardy to assure her of his safety.