Katy can't believe her luck when she finds the perfect pet guinea pig hiding in the lettuce patch, but is everything as it seems? Katy has always longed for a pet of her own, so when a cute guinea pig turns up in her mum's vegetable patch, she thinks her dreams have come true and decides to keep her. But then a new girl joins Katy's class at school and reveals that she has lost one of her guinea pigs.
Will Katy be able to do the right thing and return the pet that she's come to love?