Book 2 in The Adventures of Rosie Hart seriesRosie is looking forward to some fun in the sun while visiting the seaside with her family. But danger lurks beneath the surface of the sea. A sorcerer has cast a terrible spell over a Mermaid Princess, turning her into stone. The Mermaid Kingdom is in despair. Then Rosie arrives, and it looks like that she might be the only one who can save her. Rosie is no stranger to magic and adventure and so together with her dragon friend, she follows the trail of dark magic. What perils will they face on this dark journey?