Prince George, Prince William, Duchess of Cambridge

TRH The Duke and Duchess of Cambridge

The royal family's furry friend is starring in a new children's book!

Lupo, Prince William and Kate Middleton's pet cocker spaniel, is the subject of an upcoming book titled Lupo and the Secret of Windsor Castle.

According to a press release from Hachette Children's Books, the book (out in September) will follow Prince George's doggy on an adventure around the royal estate. "Lupo is out for a walk with Nanny and the Prince in Kensington Gardens when he is lured into the web of a terrible crime," the release reads. "Cyrus the swan has been attacked, and some precious royal treasure stolen. Lupo is innocent but his reputation is in tatters. Can he prove his innocence?"

Pippa Middleton


"Meanwhile, his rival, Vulcan the corgi is plotting to take over the realm," it goes on. "Animals take sides in a classic battle of good versus evil, involving journeys through underground tunnels, down the hallowed corridors of historic palaces, and in the staterooms of the most important people of the land. At the heart of this story is the loyal bond between Lupo and the baby prince."

Too cute.

The children's book announcement coincides with news that Kate's little sister Pippa Middleton is no longer working as a freelance writer for U.K. newspaper The Daily Telegraph. A source confirms to E! News that Pippa is no longer writing her "Sport and Social" column for the Telegraph since her contract expired in March.

Contrary to reports, her column wasn't terminated. The Telegraph had no comment on the news.

—Reporting by Lindsay Good

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