Coupeville resident Audrey Mackaman has released her debut middle school book, “Cavall in Camelot: A Dog in King Arthur’s Court.”

The book is published by Harper Collins.

Mackaman is a professional writer and editor. In this book, she tells a tale about King Arthur’s beloved dog Cavall. She will be launching and reading from her book for the public 1 p.m. Saturday, Sept. 8 at the Coupeville Library. All ages are welcome for the book signing.

The book was inspired by a passage in Arthurian Myth and follows the untold story of the dogs of Camelot, alongside familiar faces such as Merlin, Guinevere and Arthur.

According to a review by Publisher’s Weekly, Mackaman has written a “warm and action-packed series” that will appeal to young readers — ages 8-12 — and anyone who loves animals, myths, magic and adventure.

According to a press release, the plot begins when Cavall and his older brother, Glessic, leave the comfort of their simple barn to join the lavish court of Camelot. Cavall wants nothing more than to prove he’s a good dog to the great knights and dogs of the castle—especially to King Arthur. But Gless says only the best dogs are worthy of greatness, and Cavall has never been as strong, brave, or fast as his brother.

Meanwhile, malevolent forces lurk in Camelot, and Cavall must figure out how to protect his person. To make matters worse, Arthur’s mysterious nightmares are threatening to shake his grip on reality and undermine his authority as king.

To fight back against the dangers of the dream world, Cavall will need help from some loyal hounds and the enchanting, sometimes frightening creatures who call themselves “the fay.”