Book excerpt: Join Molly as she visits the enchanted dressing-up wardrobe in her Granny's house. There are so many costumes to choose from. Today she's going to be... a mermaid! With a whizz and a pop and a shower of stars, Molly dives below the sea and soon finds herself on a mission: she must race to save the mermaids' shipwreck from some pesky sharks!