The policeman continued, “We found a new clue in one of the videos. This video is from the monitoring system installed at the gate of a shop not far away from your villa. On the day of Mrs. Moorsum’s death, the shop’s surveillance camera captured the moment when Mrs. Moorsum fell off the villa. You may have a look.”

The surveillance video showed that a vague figure fell from the villa’s roof terrace at twenty-six past three in the afternoon that day.

Although the picture was unclear, ...