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?