Moriarty the Patriot (2020)

S1E22 The Two Criminals

Milverton threatens to expose Mary’s past involvement in anti-government activities, using it as leverage against her. In response, Sherlock plans to infiltrate Milverton's estate to retrieve the incriminating evidence. However, he soon realizes that Milverton was prepared for his intrusion. To make matters more complicated, Sherlock discovers he isn't the only one with plans to break in.