Read it through once

“I think that I heard a ring,” said Holmes. “Yes, there are steps on the landing. If I cannot persuade you to take a lenient view of the matter, Lord St. Simon, I have brought an advocate here who may be more successful.” He opened the door and ushered in a lady and gentleman. “Lord St. Simon,” said he “allow me to introduce you to Mr. and Mrs. Francis Hay Moulton. The lady, I think, you have already met.”