Maddy has always wanted a cat, but now she's got something even better - three small ceramic cats which come to life and give her magical powers! There's a thief in Maddy's neighbourhood, and it's up to Maddy and Greykin to stop them! Determined to catch the thief red-handed, Maddy sets up a stakeout in the back garden. But everything goes wrong, and then something terrible happens: Greykin is stolen! Can Maddy stop the thieves on her own?