“Mock’s luminous full-color artwork beautifully showcases the late nineteenth-century locations, swashbuckling pirate battles, and jungle treks, all while effortlessly distinguishing among characters (no small feat, given the expansive, diverse cast and two sets of twins). Meanwhile, Larson, befitting the seafaring adventure, keeps the pace clipping along with frequent scene breaks and propulsive reveals . . . A gorgeously executed, lively caper.” —Booklist, starred review

“Larson, best known for her graphic novel adaptation of A Wrinkle in Time, weaves a wonderful, vivid story, assisted beautifully by Mock’s illustrations, which take the twins from murky back alleys to bright and vibrant ocean scenes...A charming choice for elementary and middle school library graphic novel collections.” —School Library Journal, starred review

“Larson’s (Who Is AC?) concoction of tried-and-true adventure elements—stowaways, pirate raids, jungle tribes—hangs together convincingly, and scene-stealers such as Tarboro, a free black man who’s a brilliant swordsman and the story’s true hero, provide moral ballast. Illustrator Mock, making her debut, adeptly captures the changing relationships between the twins—especially the gender-bending awkwardness that accompanies Cleo’s stint as a boy. A sequel is promised.” —Publishers Weekly

“This graphic novel series-opener captures all the rollicking action of a Robert Louis Stevenson sea adventure—with the welcome additions of a capable female protagonist and several fully realized secondary characters of color. A variety of panel sizes keeps the pace brisk while allowing for the occasional pause to set the scene or linger in an emotional moment. Plenty of tantalizing questions remain, setting up another exciting adventure.” —The Horn Book