So far as I know, Seattle's most beloved librarian/action-figure-model has never even publicly talked about a desire to write fiction. According to the announcement, Pearl's debut novel, George and Lizzie, is about a married couple that has....

...radically different understandings of what love and marriage should be; he grew up in a warm and loving family in Tulsa, Oklahoma, his father an orthodontist, his mother a stay-at-home mom while she grew up as the only child of two famous psychologists who related to her more as an in-house experiment, than a child to love; it extends from their first meeting to more than a decade into their unlikely marriage...

It'll be published by Touchstone in June of 2017.