Someone has been pilfering diamonds from wealthy poodle owners - and it's up to the Critter Gitters to solve the crime! With the help of Professor Headful, our heroes uncover two international thieves who smuggle the jewels with unwitting homing pigeons. The kids capture them in the act during an elaborate sting operation, but the criminals escape to Switzerland. If justice is to be served, there's only one thing to do ... follow them!