Roger has moved the family over to Australia because of work, forcing Sapphire to leave Ingo behind. What'll happen when she meets three mermaids, with a secret similar to hers? Set after series one of H2O: Just add water, and The Crossing of Ingo. Rated T for later content.

After the events of the Crossing Of INGO and the first H20 season, Sapphire is now 16 and is a transfer student at the H20 girl's school. How will the girls cope with learning about the world of INGO and Sapphire and her Mer friends learning about the magic of the Moon pool. Adopted by Ocean-runner.