I liked this better than Nim's Island. It had a little more action and suspense - more like the movie version of Nim's Island. I hope they'll make a movie of this one too.
Book Description from Amazon.com
This time Nim’s the fish-out-of-water as she stows away on a cruise ship to save her kidnapped sea lion friend. Accompanied by her likeable iguana, Fred, the island girl lands with a splash in Manhattan, on the run from of a very Bad Guy, and on her way to reunite with her friend, cowardly adventure novelist Alex Rover. Kids who are interested in animals and animal welfare will enjoy this warmhearted story’s combo of suspenseful high-seas happenings, New York City excitement, and family drama.