Penelope is a 10-year old girl who lives in the United States. Her favorite animal is the platypus. During a previous vacation to King Island, Australia, Penelope discovered a secret, intelligent group of platypuses. They speak English, play musical instruments, and joke around with each other. The platypuses welcomed Penelope into their “family” and she told no one about them.Penelope is planning another trip to King Island. She can’t wait to see the platypuses again and thinks it would be fun to create a platypus orchestra. But how can she make that happen while keeping the platypuses a secret?