When a truly terrifying sound wakes the inhabitants of a fairytale kingdom, clever Princess Daisy soon figures out the problem but her father the King just won't listen.

After all, what can a princess do? But when the knights who come to the rescue prove to be a big bunch of nincompoop scaredy-cats, things start to look rather bad.But what's this?

Riding a cow and armed with a book rather than a sword, a fourth mystery knight dares to enter the dragon's den.

Whoever can it be? Why it's Plucky Princess Daisy ...of course!