Best friends Prissy and Sissy have made it safely back to land, after being stranded for days on an island with murderous pirates, a mad sea captain, a dead body, and a monkey they've named Spot. Not only have they survived the experience, but they have spirited away a cache of pirate's treasure, made up of gold coins and diamonds. But just when they think they might be safe, the friends find a note slipped under the door of their hotel room. Someone else knows about the treasure - someone who is determined to have a share. Again with only each other to count on, the two women escape to Italy, attempting to stay one step ahead of their pursuer. Prissy and Sissy are in need of another back-up plan. Will this one work?