Name: The Crossing of Ingo
ISBN: 9780007270255

Helen Dunmore

Sapphire, Conor and their Mer friends Faro and Elvira are ready to make the crossing of Ingo - a long and dangerous journey that only the strongest young Mer are called upon to make. Ervys, his followers and new recruits, the sharks, are determined that Sapphire and Conor must be stopped - dead or alive.

The Crossing of Ingo

Callie Anna

The series finished well. I was pleasantly surprised that the author wasn't fishing (no pun intended) for another novel. She completed the story and wrapped up the loose ends, but not in a typical way.