Mycroft Holmes - Kareem Abdul-Jabbar, Anna Waterhouse
Is it heretic to say that I prefer Douglas to Watson?

This book looks at Sherlock Holmes' brother Mycroft in his early salad days, if you can see the Holmes' bros as having salad days. Mycroft's best buddy is Douglas, a black American, and Douglas actually plays a greater role in the story than Watson. The story is a good mix of action and mystery. It also ties in very well with history, so the story itself is largely believable. Sherlock, too, makes an appearance. The only false note is the romantic love interest sub-plot. It isn't the romance, but any reader of Sherlock Holmes will know exactly how it is going to end up.