Shifty mcgifty and slippery sam: the diamond chase (Nosy Crow Ltd)

Shifty McGifty and Slippery Sam have swapped their life of crime for a career in cupcakes. But when they're asked to bake for a seriously swanky party, Shifty and Sam find themselves caught up in the middle of a robbery. Somebody has taken Lady Kate's tiara, and all the clues point to the thief being a penguin. But there are dozens of penguins at the party - it doesn't look like this is going to be a black and white case... Can Shifty and Sam get to the bottom of the mystery and catch the culprit?