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Gerald Westfield is shipwrecked near Papeete in French Polynesia while on vacation. After floating in the ocean on a makeshift raft, he ends up on a small tropical island.
Several months of survival on the island pass before Gerald discovers the entrance to another dimension in the back of the cave that he had been occupying.
Gerald passes through the portal and meets a family in this new world. While learning their language and customs, he falls in love with the daughter of his newfound friends.
The country in this new dimension is at war, and as the battle draws closer, Gerald decides to return home to see his family and avoid the conflict. Unfortunately, before he can leave, Gerald is arrested and put in prison for not serving in the military.
After being released from prison, Gerald decides to build a raft, head out to sea, and endure the hardships and possible death in his attempt to return to his homeland and family.
As the war intensifies, the family that Gerald met in the other dimension are forced to enter the portal to seek shelter. After building a raft and setting off at sea, they are finally rescued.
Using the passports that Gerald had salvaged from the bodies of deceased passengers aboard the fatal ship, Gerald's friends make their way to Hawaii and start their search to reunite with their friend.