The Secret Island: Secret Series #1

Peggy Arnold, and younger twin siblings Mike and Nora, are living with a harsh aunt and uncle after their parents are thought to have been killed in a plane crash. In this first adventure, aided by an orphan boy, Jack, they have befriended, they run away to an island on a nearby lake, and together they make a new home constructed with the branches of a willow tree, this much-loved "living house" being one of the highlights of the story.. However, living on one's own turns out to be far more difficult than they thought, and, along with a lot of fun and happiness, they also suffer a lot of hardship - especially when winter sets in. It does not help that the police are looking out for them, too, and Jack has to be very careful when he ventures ashore to sell produce at a market, and has one or two narrow escapes from being detained by them