Animal lover and champion Irish dancer Samantha Hannigan is having a truly woof week. She and her best friend Ajay were messing around with the Brain Swap 3000, one of her grandad's crackpot inventions, and now Sam is stuck inside the body of her neighbours' dog - and it'll be days before they can change her back!

How long can they pretend Sam is just dressing up in a dog costume for charity? Are her chances of winning the big dance competition scuppered? What's going on behind closed doors at Roger Fitzmaurice's dog-biscuit factory? And, um, why has Sam suddenly started to chew on slippers and bark at the moon?