The Sign of Four

I really liked this book. As with every Sherlock story, the writing is incredible and soothing in a way that very few other books accomplish.

I was loving every bit of the story up until they went after the launch, it seemed to hit a bump on the road and it only went back up again when they had finally captured Small. 
I would rank this slightly lower than A Study in Scarlet, but still a great entry in the Sherlock universe.