When they mysteriously wake up back home from being lost in the Unknown, brothers Greg and Wirt have to help their friend Beatrice--a talking bluebird--return safely before anyone realizes she can talk. 

When Greg and Wirt make it back home from the Unknown, their victory is bittersweet when they realize Beatrice came as well. Now, it's up to them to help Beatrice return safely to the Unknown before anyone realizes she can talk. As the brothers juggle keeping Beatrice's secret safe as Sara expresses a newfound interest in Greg, only Beatrice notices something sinister lurking in the shadows...

The Eisner Award-winning series goes further into the Unknown with this all-new original story by Eisner Award-winning writer Jonathan Case (Green River Killer: a True Detective Story) and Eisner Award-winning Over the Garden Wall artist Jim Campbell.