Grades 4-7. Marrill is used to adventure; she and her parents travel the world so much that she has never lived in one place for more than six months. But after a sailing ship emerges in the wavering heat mirage of an Arizona parking lot, and Marrill finds herself stuck aboard, she is in for her biggest adventure yet. Desperate to find a way back to her family, she recruits the help of the wizard Ardent and his crew, as well as a young boy, Fin, whom everyone except Marrill forgets as soon as he is out of their view. While sailing on the Pirate Stream, a body of water that connects the known universe, the adventurers race to find pieces of a cleverly imagined map to everywhere, before an evil wizard can get them first. Ryan and Davis’ swashbuckling quest features fantastic world building, gnarly creatures, and a villain who is both spooky and formidable. Each new location is a treasure, and even the ships themselves are full of character. Ardent’s ship, for instance, is manned by a giant made of rope (he handles all the rigging, naturally). The unique details, expert plotting, charming characters, and comic interludes combine in a tantalizing read that’s made even more appealing by the promise that the story will continue in future volumes.