Mister White Mason, Is It Credible?

Holmes and Watson were called to a village in rural england. A man had been found dead at an old manor house near the moat. He was believed to have killed himself with a ring, but this is not confirmed. Holmes decided to take his friend down to see if he could find out more about the case. The pair arrived at the scene of the crime shortly after midnight. They saw no sign that anyone has landed on the ledge or waded into the water. It appeared as though it would be impossible for any one person to make their way across the moat without being seen by someone who knew what they were doing. After examining the spot where the body was found