Imagine if your baby sister could make wishes come true... Flick has just found out her little sister has a special gift. Birdie has wished for a super-fabulous unicorn party and it has magically appeared in their backyard! There's a rainbow slide made out of sour straps, a ball pit full of marshmallows and a real-life unicorn that poops cupcakes! How can Flick stop the nosy next-door neighbour finding out about Birdie's magic when the birthday cake is floating like a cloud?