A special outing to the uninhabited Penguin Island near New Zealand becomes an all-out adventure for Philip, Dinah, Jack and Lucy-Ann when they are stranded there after a storm.
But is the island quite as deserted as it appears? Who is the mysterious Horace Tipperlong? Why have the penguins disappeared from the island? And who are the evil villains who will stop at nothing - not even murder - to keep their secrets safe?