Title: The Baker Street Letters (Baker Street Letters Series #1), Author: Michael Robertson
Title: The Brothers of Baker Street (Baker Street Letters Series #2), Author: Michael Robertson
Title: The Baker Street Translation (Baker Street Letters Series #3), Author: Michael Robertson
Title: Moriarty Returns a Letter (Baker Street Letters Series #4), Author: Michael Robertson
Title: The Baker Street Jurors (Baker Street Letters Series #5), Author: Michael Robertson