‘Enola Holmes 2’ cleverly puts Millie Bobby Brown back on the case

The game is afoot (again) in “Enola Holmes 2,” a wonderful showcase for Millie Bobby Brown that this time manages to work the character’s famous brother, Sherlock, more organically into the mix. Throw in fact-based underpinnings about horrid working conditions during the time and you have the makings for a very polished sequel — one that makes the whole thing look elementary, and a whole lot of fun.