A boy and a girl---alone against a ship full of mutineers. High adventure on the high seas, with the great star of romance leading the way.

While Joel and his older ship's captain brother Mark are at sea, the latter is abandoned in Singapore by devious ship's mate Finch who, upon their return, convinces the townspeople that Joel abandoned his brother. Joel, determined to not only find Mark but to see justice done, returns the ship to Singapore.