
Julian, Dick and Anne arrives At Kirrin cottage for the hiolidays. George is not very happy with their arrival. Her father is edoing secret experiments on her island. Geoerge hasa secret of her own too. Julian, Dick and Anne discovers a tunnel that leads under the sea they assume. They finally become friends. The next day the whole family goes to Kirrin island to bring supplies to Professor Kirrin. The children becomes suspicious when a stranger asks questions about the professor.moreless