01 - Book 1 - A Problem of the First Order - Chapter 1 - Let Someone Speak

02 - Book 1 - A Problem of the First Order - Chapter 2 - In Room B

03 - Book 1 - A Problem of the First Order - Chapter 3 - "I have Something to Show You"

04 - Book 1 - A Problem of the First Order - Chapter 4 - A Strategic Move - Part 1

05 - Book 1 - A Problem of the First Order - Chapter 4 - A Strategic Move - Part 2

06 - Book 1 - A Problem of the First Order - Chapter 5 - Three Where Two Should Be

07 - Book 1 - A Problem of the First Order - Chapter 6 - The Man in the Gallery

08 - Book 1 - A Problem of the First Order - Chapter 7 - "You Think That of Me"

09 - Book 2 - Mr. X - Chapter 8 - On the Search

10 - Book 2 - Mr. X - Chapter 9 - While the City Slept

11 - Book 2 - Mr. X - Chapter 10 - "And He Stood Here"

12 - Book 2 - Mr. X - Chapter 11 - Footsteps

13 - Book 2 - Mr. X - Chapter 12 - "Spare nobody: I say, Spare Nobody!"

14 - Book 2 - Mr. X - Chapter 13 - "Write Me His Name"

15 - Book 2 - Mr. X - Chapter 14 - A loop of Silk

16 - Book 2 - Mr. X - Chapter 15 - News from France

17 - Book 3 - Storm In The Mountains - Chapter 16 - Friends

18 - Book 3 - Storm In The Mountains - Chapter 17 - The Cuckoo-Clock

19 - Book 3 - Storm In The Mountains - Chapter 18 - Mrs. Davis' Strange Lodger

20 - Book 3 - Storm In The Mountains - Chapter 19 - Mr. Gryce and the Timid Child