Welcome to Mermaids Rock! The entrance to the mermaid realm in the deep, blue ocean... Marina is new in Mermaids Rock, having travelled the world with her scientist dad, and she can't wait to make friends! She meets a gang of mermaids who love animals and the environment as much as she does and the group soon face their first challenge... The beautiful coral caves nearby have been damaged. Who could have caused the destruction? And are they dangerous? From the author of STAR FRIENDS comes the first in an exciting new series about the wonders of the ocean, perfect for fans of RAINBOW MAGIC, Barbie Dolphin Magic and Holly Webb.