
One morning, Watson receives a telegram from Holmes. A man has been killed beside a pool in the countryside, and his son is under suspicion. Someone saw the father and son quarreling, and the testimony appears unfavorable to the young man. Traveling west by train, Holmes and Watson examine the newspaper's account of the case and the son's own words.

While Watson is having breakfast with his wife, an invitation to travel arrives from Holmes. The two men take a train west. Their conversation concerns a death beside a pool and the suspicion surrounding the son who was there. With a newspaper in hand, Holmes and Watson each bring their own perspective to the same testimony.

The afternoon train reaches Ross, where Holmes and Watson meet the waiting Lestrade and head for the inn. While they discuss preparations for visiting the scene, a carriage stops outside. Hearing from people concerned about the case, Holmes and his companions try to establish circumstances that the newspapers alone cannot tell them.

On a clear morning, Holmes and his companions travel by carriage to the farm. As they discuss the people involved, questions arise even about familiar facts. A path leads from the farm to the pool, across damp ground between the trees. Holmes enters the scene and examines for himself what has been left there.

Back in the inn's sitting room after the investigation, Watson listens to Holmes's explanation. As he considers the connections between apparently separate events, a waiter announces a visitor. Holmes welcomes the arrival and offers a seat. The conversation the two friends have been conducting pauses, and a new exchange is about to begin quietly.