1 of 5
What is the famous address where Holmes is based?

2 of 5
Watson acts as a foil for which character?

3 of 5
Who is described as "a small, alert, dark-eyed man about thirty years of age, very sturdily built"?

4 of 5
Which two qualities described the recently deceased Charles?

5 of 5
What pseudo-science does Mortimer have an interest in?