Though trembling with gratitude at Albert's revelation and in awe of his ancestor's literary genius, Tsun glances up the path to see Captain Madden approaching the house. He asks Albert to see Ts'ui Pên's letter again. Doctor Albert turns to retrieve it, Tsun draws a revolver, and declares his friendship before murdering him in cold blood.
Doctor Tsun is arrested, convicted of murder, and sentenced to death by hanging. However, he has, "most abhorrently triumphed," as he has revealed to Berlin the location of the artillery park. Indeed the park is bombed as Tsun goes on trial. The location of the artillery park was in Albert. Doctor Tsun had realized that the only way to convey that information was to murder a person of that name, so that the news of the murder would appear in British newspapers connected with his name.