Sea of Legends - Island of Fog, #11

The young shapeshifters ARE BACK in their 11th fantasy adventure! When Miss Simone sends Hal and his friends on a mission to find the fabled edge of the world, they set sail with a crew of goblins and soon run afoul of a sea monster. But instead of sinking to the bottom of the ocean, their crippled ship is carried by a giant turtle to a place beyond their wildest dreams. So begins their journey to a magical place inhabited by immortals and littered with shipwrecks and bones.
There's a very good reason why nobody has ever returned to tell the tale of Haven... Full of wondrous (and terrifying) creatures, the eleventh book in the magical Island of Fog fantasy series explores the legends of eastern yokai folklore and delivers action and excitement for middle-grade readers and up. This is a complete story in itself, a great place to jump in and meet the young shapeshifters if you haven't read the other books in the series.