The Ice Diamond (Rescue Princesses Series #10)

These are no ordinary princesses--they're Rescue Princesses! Princess Maya is delighted to welcome the Rescue Princesses to the Kingdom of Lepari. It's a beautiful land, where the King has sworn to protect the rare snow leopards that live in the mountains. Maya and her new friends are devastated to learn of a plot to harm the animals. The Rescue Princesses and Maya want to save them, but first they must learn to become invisible, with the help of the mysterious Ice Diamond!