11 books • 6 series
The Thundering Underground (Baker Street Detectives, #4) (Baker Street Mysteries (Nelsonword), #4) (The Baker Street mysteries, #4)
The Mystery of the Yellow Hands (Baker Street Detectives, #1) (Baker Street Mysteries (Nelsonword), #1)
The Giant Rat of Sumatra (Baker Street Mysteries (Nelsonword), #2) (Baker Street Detectives, #2) (The Baker Street mysteries, #2)