Grace has proved to the kingdom of Wondermere that when it comes to courage, determination, playing TROLL-O on unicorn-back and being a BRAVE KNIGHT, she's just as good as any boy!But now Wondermere is expecting a VERY IMPORTANT visitor: the MERMAID QUEEN of the Outer Ocean.That means frilly dresses and best behaviour – and absolutely NO RULE BREAKING.But when a purple DRAGON EGG falls into the moat of Wondermere castle, Grace and her sister Princess Portia find themselves babysitting a BIG SECRET.One teeny tiny little dragon called Dennis couldn't possibly disturb the royal visit … could he?Have you read all of the books in the series?DO NOT DISTURB THE DRAGONSDO NOT MESS WITH THE MERMAIDSDO NOT PANIC THE PIXIES