This is such a great ending to the series, as Rollie and his detective friends face off against the evil Herr Zilch for the final time. Zilch has plans to destroy Sherlock Academy, and Rollie must decode the clues before the entire school is gone.

I loved everything about this book! The characters, the plot, the mystery, the action, the school, the writing style... everything is wonderful!

Rollie is an excellent main character. He's smart and observant, and he wants to be just like Sherlock Holmes. I really identified with his thought process and his emotions and excitement in the middle of a mystery.

I loved the easy friendship between Rollie and Cecily. They are great friends, and it really shows in their banter and camaraderie. I loved how they nickname each other "Holmes" and "Watson."

The writing style is excellent, drawing the reader into the story. The plot leaves little foreshadowing clues all over the place for the reader to wonder over until the mystery is revealed. I love the puzzles and codes, and the plot kept me interested right to the very end.

Disclaimer: I received a copy of this book from the publisher in exchange for a free and honest review. All the opinions stated here are my own true thoughts, and are not influenced by anyone.