Twins Gert and Phil realise there's sure to be trouble when the Morris family moves in next door. After the twins rescue kittens that the Morris kids have tried to drown and then vandalise their backyard, the war is on! In retaliation, the Morris kids rub their dog down with shoe polish and then steal the canine. Only learning the truth of their background allows the twins to forge a truce...and offer to help out instead of counterattack.