After his success on the silver screen, Marshmallow Pie, a big, fluffy cat with an even bigger personality, has an exciting opportunity to act on stage in a grand theatre. It will be his first time in front of a live audience! The bad news is, he has to share the stage with his unbearable neighbour and arch-enemy, Buster the dog. Pie is convinced Buster is out to ruin it for him! But there's a mystery to solve both on the stage and off, and Pie's...