Though always an energetic lad, Sherlock’s older brother Mycroft had always been plump and slow. We find Mycroft dealing with word of a spy, in his characteristic laid back way, and planning to solve this mystery without leaving London. Traverse reports on the happenings of the lady spy at the theater.
Following his own trail, Sherlock finds his way to the theater with Watson at his side. The stage magician, the Great Gandolfo, carries out an impressive disappearing trick, complete with a disappearing spy as his assistant. Sherlock thinks he has the trick figured out, and demonstrates to Watson after the fact.
At a later show, Holmes and Watson watch the stage activities closely, but somethings wrong. The spy has been murdered. Now the police join the observations of the stage, and a race is on to see whether they’ll solve the case before Holmes does.
Given the nature of the trick, a twin sister is in grave danger. Will all the loose ends be tied up, or should the aging Sherlock just return to his beekeeping? Has Mycroft figured out the mystery?