The Sundial by Fred M. White

As was only natural in the circumstances, the tragic death of Mrs. John Charlock created a profound sensation. The accident to the French maid had set most people talking, but the unfortunate end of the mistress in the same mysterious fashion bade fair to become a general topic of conversation. The whole thing was so simple and yet so strange and out of the common. A score of theories were set on foot, but not one of them worked out in a satisfactory manner. The police were plainly at fault, and though Inspector Battley was reinforced by a colleague or two from Scotland Yard, the end of the week found the authorities no nearer the solution of the trouble than they had been at the beginning of the inquiry.

As for Grey and Tanza, they went their own way, which was by no means the way taken by the police. Ephraim Bark was still in the neighbourhood, and all his movements were watched by Tanza and Grey with a patient care which would have astonished that worthy had he only known of it. Grey had his own theory, which he was developing slowly. It was an integral part of his theory that Bark could have said a great deal more had he chosen to do so. And there was yet another person whom Grey was keeping a close eye upon. He had by no means forgotten the torn photograph he had found in the French maid's room. He did not ignore the information as to Arnold Rent's strange friendship with the dead Frenchwoman. And there was another item of which, as yet, Grey had said nothing to any one. He was coming to his conclusions now--conclusions so strange and startling that he hardly dared trust himself to believe them. A week passed slowly, during which nothing particular had happened, and Arnold Rent appeared to get no better. So far as Grey could gather, his brother scientist bad had a nasty fall, which, for the time being, had affected his intellect. There was a good deal of mystery about the affair, and Grey was at some pains to make the acquaintance of the doctor who was attending Rent. The thing was accomplished at length through Tanza, who made some pretext for inviting the doctor to dine aboard his yacht. Very cautiously and patiently Grey led up to the subject which was next his heart. The thing was so naturally done and Tanza played into his hands so cleverly, that the doctor fell into the trap at once.