This is the fifth in the Dragon Keepers series. There is also a website - thedragonkeepers.com - with a complete guide to the world of the Dragon Keepers. Young fantasy fans will enjoy these further adventures of Jesse, Daisy and their dragon Emmy. This time the kids are visiting their grandmother, Polly, who has an inn near the sea. They discover a second dragon's egg by the sea and are swept into a battle to control it before the egg hatches. And the egg is nearly ready to hatch!This one has lots of undersea adventures when Jesse and Daisy grow gills and have their legs turned into tails. The get to explore and undersea world complete with selkies, mermaids, kelpies, and other magical creatures. The also spend time aboard a sunken ship named the Golden Dragon.The villain of the story is the dreaded Mermage who is the worlds largest sea cucumber. And, even though he is not able to move, he creates a real sense of menace in the story.I think that this series would be especially good for upper elementary students who like the combination of fantasy and adventure. I also like the friendship between Jesse and Daisy and the way that they care for their dragon Emmy. They was also a lot of challenging vocabulary in this story because it was filled with nautical terms and other new vocabulary.