Every summer, Miriam spends a week at her Babajoon and Mamanjoon's house. It's her favorite part of summer because every day with her grandparents is an adventure. But when coins fall out of Babajoon's pocket as he's getting ice cream, Miriam finds one coin that doesn't look like the rest--a gold one unlike Miriam has ever seen before.

Suddenly, she starts to notice certain things about her Babajoon. He can talk to parrots. He speaks with codewords. He trades crystal treasures with his friends. Could her Babajoon be...a pirate?