6Chapter Four.: The Man who Knew.
23Chapter Twenty One.: Shades of Soho.
7Chapter Five.: Contains some Curious Facts.
24Chapter Twenty Two.: One Fact is Established.
8Chapter Six.: Just Too Late.
25Chapter Twenty Three.: Which Makes One Fact Plain.
9Chapter Seven.: The Mysterious Mrs Saxton.
26Chapter Twenty Four.: The Mystery of the Maid-Servant.
10Chapter Eight.: The Man from Boundary Road.
27Chapter Twenty Five.: Still More Mystery.
11Chapter Nine.: Rumours in London.
28Chapter Twenty Six.: The Secret Picture.
12Chapter Ten.: In the Lobby of the House.
29Chapter Twenty Seven.: The Story of the Portraits.
13Chapter Eleven.: Mainly Concerns Mr Stent.
30Chapter Twenty Eight.: In the Mists.
14Chapter Twelve.: The Occupier of Forest View.
31Chapter Twenty Nine.: Contains many Surprises.
15Chapter Thirteen.: Contains Further Discoveries.
32Chapter Thirty.
16Chapter Fourteen.: The Cipher of the Two C’s.
33The Mystery Solved.
17Chapter Fifteen.: In which Smeaton Makes a Discovery.
34Three Months Later.
