William helps to cover up Enders's crime, and Enders believes he is in the clear. As the first ballet performed aboard a sailing vessel takes place, William and the others secretly prepare another production in criminal theatre behind the scenes.

Searching for the true killer of Count Drebber, Sherlock and John set a trap for the culprit using a wedding ring found at the murder scene as bait. After a struggle in which the ring is lost, Sherlock is able to deduce who the real killer is.