For Flash the dolphin and Moon the sea turtle, exploring a deep underwater cave is the perfect adventure—until a sudden storm collapses the entrance, trapping them in the darkness.

Told in a captivating, page-turning rhythm, this story follows the two friends as their air supply dwindles. To find their way out, they must navigate twisting passages and face strange sea creatures, relying only on their courage and each other.

With time running out, will their teamwork be enough to escape the enchanted depths before it's too late?