Max and Oscar are given a pet ID microchip to identify. A rice-sized electronic device, Max has never seen anything quite like it. Using an ancient library book scanner, he obtains a reading from it. It's a mysterious code, with the Bluggsville City logo beside it. Max and Oscar uncover the identity of the dog it was assigned to and are determined to find out why the chip was never implanted. Oscar, smitten by the dog in the photo, is especially eager. When their hunt lands them at a pound for robo-dogs, they resolve to set the dogs free. Little do they know the chip is transmitting their location details to forces that threaten their own freedom.