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.
Ha, there it is again.
Sie tun es wieder.
Mira, ahí está otra vez.
Tu le refais.
E está apertando de novo.
Вот опять.