A family in route to New Guinea is shipwrecked on a deserted tropical island. They are forced to remain on the island because of the damage to the ship and the pirates that are roaming the islands. They create a home on the island (centering around a huge tree house) and explore the island and its wildlife. Plenty of adventure ensues as the family deals with issues of survival and pirates, and the brothers must learn how to live on the island with an uncertain future.

Bertram Oliphant West (also known as Bo West) wants to clear his unjustly smeared reputation. He joins the Foreign Legion, with Simpson his manservant in tow. But the fort they get posted to is full of eccentric legionnaires, and there is trouble brewing with the locals too. Unbeknown to Bo, his lady love has followed him in disguise...