[1] Nancy receives a mysterious letter claiming she has won a week-long holiday for two at the Sweet Springs Resort on Anchor Island in the Bahamas.

The enclosed plane tickets are for the next day, so she sends her friends Bess and George to go to the resort, and she and her dad will follow later.

After Bess and George have left for Anchor Island, she and her dad, Carson Drew, go down to Miami to investigate a mysterious ship.

The boat is owned by Jeff and Lena DeFoe, who Nancy finds out are the owners of the Sweet Springs resort.

INA version The first edition featured cover art by Ruth Sanderson and six internal illustrations by Paul Frame.