Books in the Mermaids Rock series

When Coralie finds a mysterious treasure map in a kelp forest, she and her friends can't wait to explore. But the forest has been destroyed. They'll have to do everything they can to save the forest creatures before it's too late...

When Marina's dad goes missing in the Arctic while on a research trip, Kai and the friends help her on a rescue mission. But with the ice melting, the friends will need to find him fast...

When fish start disappearing from the reef into the deep, dark Midnight Realm, Naya and her friends investigate!

Marina is new in Mermaids Rock and is thrilled to make friends straight away! Her group soon face their first challenge when the coral caves nearby are damaged. But who could have caused the destruction?

Accidentally transported to a dark, underground river, Marina and her friends discover an amazing jungle. But will they ever be able to get back home?

While exploring a shipwreck in the Red Sea, Kai and his friends come face to face with humans for the first time. Can they get back home without revealing the secret existence of mermaids?