When the sea begins to lose its shimmer and glow, Bramble the pirate and his trusty pup, Sausage, are called upon by an old sea turtle captain with a long-forgotten secret: the Coral Kingdom.

Guided by a magical diving suit, Bramble and Sausage descend into the deep blue to discover a wondrous underwater world. But trouble bubbles beneath the waves-the merfolk are in despair. Their glowing coral, the heart of their city and the source of its light, has been stolen!

With courage, cleverness, and a little salty humour, Bramble must brave sea caves, sneak past sleepy sea monsters, and dive into a mystery that leads deeper than anyone imagined. Can he uncover the truth and help the Coral Kingdom shine once more?