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 ginger-and-white guinea pig turns up in her mum's vegetable patch, she thinks her dreams have come true!

Katy calls the guinea pig Lettuce, as that seems to be her favourite food, and makes a lovely home for her in an old greenhouse at the bottom of the garden.

But where has Lettuce come from and will Katy really be able to keep her?