His Last Vow

In this episode it was all mystery, drama, suspense, and a little bit of a thriller. So Mary is a companion of Magnussen or you could say an assistant. Also Mary shot Sherlock and then she was the one that called the ambulance. Then, Sherlock was "fading" in his mind palace while in real life he was dying. Later, Moriarty appears in his mind palace and tells him if he's going to let John down. A few minutes later he wakes up and leaves the hospital. This episode was really shocking for me.