Holmes (now retired) and Watson take on another case.
Someone is attacking Lord George Sanger's famous circus. The culprit poisons a lion, sets fire to the tents, and does other dangerous things.
Sanger engages Holmes to find the person and to stop the threats. And Holmes does.
Then ten years later, the police accuse a loyal employee of murdering the now-retired Sanger. Holmes feels an obligation to Sanger to find out what really happened.
Holmes' solution ties the two parts of the story together.
As you would expect, the writing style mimics Conan Doyle's, the story frequently refers to other authentic Holmes adventures, and Watson is as much in the dark as ever.
This short book was quick reading. Only a couple of hours or so for me, and I am a slow reader. Reading it was a nice interlude, a break after some hard reading.
If you like Conan Doyle's writing and if you don't totally object to pastiches, you might enjoy Sherlock Holmes and the Circus of Fear.