What happened in Ruby in the Smoke, Chapter 13?

In Chapter Three, Sally receives a letter from Major Marchbanks, who lives in Swaleness. He tells her to come see him, as he has important information for her and she may be in danger. She sets off on the train and arrives at a small town by the sea. There is no-one about except a photographer who is taking a picture of the beach. Sally asks him where the house is and then talks to him briefly.

When Sally reaches the house, Major Marchbanks steps out and greets her, and takes her to a veranda round the side of the house. He tells her that he has an enemy called Mrs. Holland who is now inside his house, and that this woman is now Sally's enemy too. She asks him about The Seven Blessings and her father's death, but he knows nothing about them. She asks if he used to live in Chatham and he says he did, so she knows that this is the man her father had intended her to find. However, before Marchbanks can explain anything, a servant appears and tells him that Mrs. Holland is now in the garden. Marchbanks gives Sally a parcel that he says will explain everything, and then tells her to get away quickly. Sally is confused, but she does as he says.