“After this, what kind of songs do you think they’ll be singing about her over their beers, mate? She’s legend.” In a way, that sums up my newest book, “Girl on a Dolphin.” It’s Book Two of The Neptune Chronicles, and it takes you deeper into their underwater world. “Daddy, daddy! People on dolphins! There are people on dolphins out there!” Jamie and Mercy have been living on a tiny island for five years, and their daughter, Saffron, just ran in to tell them that she saw Neptunes riding on dolphins. They have to travel to both sides of the globe to forestall what people are calling “The Dolphin War.” With the balance of power over and under the seas at dire risk, can they bring peace between the Neptunes and the humans in time? “Girl on a Dolphin” brings us closer to the almost human race beneath the waves.