In this new chapter book series featuring the mermaids of Mermaids Rock, Marina has just moved to Mermaids Rock and is thrilled to make friends right away. She and her friends soon face a mystery when the coral caves nearby are damaged. But who--or what--could have caused the destruction?Marina is new in Mermaids Rock. She has traveled the world with her scientist dad, and she can't wait to settle down and make friends! She meets some mermaids who love animals and the environment as much as she does. Soon, the group faces their first challenge: The beautiful coral caves nearby have been damaged. Who--or what--could have caused the destruction? And are the creatures dangerous?Join Marina and her mermaid friends in the beautiful coral reef at Mermaids Rock! Whether they're working together to help sea animals in danger or solving a mystery of the deep, the friends at Mermaids Rock will do anything to protect their ocean home and if there is a ripple of adventure they will find it!