HarperCollins The Improbable Tales of Baskerville Hall Book 3: The Valley of Lies
HarperCollins The Improbable Tales of Baskerville Hall Book 3: The Valley of Lies

The Improbable Tales of Baskerville Hall Book 3: The Valley of Lies

By Ali Standish

$19.99

Publication Date: November 4, 2025

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Ages 8 to 12, Grades 3 to 7

The final installment of this fantastic mystery series from award-winning author Ali Standish and the Conan Doyle Estate, set in a secret school for extraordinarily gifted children. It’s The Mysterious Benedict Society meets The Adventures of Sherlock Holmes. Currently in development for TV with Ron Howard at Imagine Entertainment and sold into 20 foreign territories and counting! 

In Book 3, Arthur must do the unthinkable: betray his friends and Holmes or pay the price.Arthur should be happier than ever. He made it into the esteemed Circle of Light, Professor Sherlock Holmes believes he has tremendous talent, and his friendships are stronger than ever. However, Dinah Grey’s ominous letter and her dangerous hold over his little sister Mary have left Arthur riddled with anxiety and fear. It’s not long before another letter arrives and makes the key to Mary’s salvation clear: Arthur needs to insert himself in Sherlock’s next excursion and report back.When the annual first-year trip to the Lakes is announced, Arthur suspects that the place known for the renowned poets who called it home is key to her plan. While sticking close to Holmes, Arthur meets John Ruskin, one in a long line of protectors of the Brazen Head, a powerful relic whose wearer can ask any question and have it answered. But there are more eyes on Sherlock and the relic than Grey’s. Arthur will have to walk the thin line between truth and deception in order to save his sister, but it might cost him more than he realizes.

About the Author

Ali Standish is the award-winning author of books for the young and young at heart, including the Carnegie-nominated The Ethan I Was Before, August Isle, Bad Bella, The Climbers, How to Disappear Completely, The Mending Summer, and Yonder. Her books are Junior Library Guild Selections, have received starred reviews from Publishers Weekly, Kirkus Reviews, ALA Booklist, and School Library Journal, have been named as Indie Next titles and nominated for Goodreads Choice Awards. During her years living in a tumbledown Victorian cottage in the UK, she obtained a master’s degree in children’s literature from the University of Cambridge. She now resides in North Carolina with her husband and sons. You can visit her online at alistandish.com.

Format: Hardcover

Length: 304 pages

Publisher: HarperCollins

Publication Date: November 4, 2025

ISBN: 9780063275676

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