Milverton blackmails Mary, exploiting her dalliance in antigovernment activities as a student. Sherlock decides to sneak into Milverton's estate to steal his evidence, but even that act was anticipated. Sherlock finds that he is not the only trespasser.
Once you kill a man,
killing another makes no difference.
Hat man einen Menschen getötet,
Una vez matas a una persona,
matar a otra no hace ninguna diferencia.
Après avoir commis un meurtre,
Uma vez que você mata um homem,
matar outro não faz mais diferença.
Убивший один раз