The Island of Surprise.

Robert Lovell falls in love with his father’s secretary Dorothy Arden and marries her in secret despite his father and his business partner Daniel Casselis’s attempts to arrange a match for him with Daniel’s daughter, also named Dorothy. When circumstances lead to the three young people ending up stranded on a lonely island in the Pacific, complications ensue, especially when Bob suffers a blow which temporarily wipes out his memory and he cannot remember which Dorothy is his wife! All ends happily, however.