AllMovie

Two couples, Helen (Louise Lovely) and Byron (Philo McCullough), and Frances (Rosemary Theby) and John (William Scott) get married at the same altar and head off together on a joint honeymoon. But the ship wrecks and they are cast onto separate parts of an island with the wrong spouses. Although Helen and John care for each other, they don't step outside their marriage vows. Frances and Byron, on the other hand, immediately go for each other. Byron eventually discovers the presence of the other two, but when a rescue ship comes, he and Frances leave their legally wed partners behind to certain death. Helen and John nevertheless manage to make it back to civilization and Helen walks in on Byron, who is living with Frances. Frances, in a fit of anger and panic, shoots Byron and then turns the gun on herself. This gruesome end enables Helen and John to marry like they should have in the first place.