"Princess Irene" is a children's book written by Johanna Spyri, the author best known for her classic work, Heidi. The story follows a young princess named Irene who embarks on a magical adventure in a mysterious underground world. Along the way, she learns valuable lessons about courage, friendship, and the importance of kindness. The tale features a character named the Goblin, who initially poses a threat to Irene and her friend, the Princess's nurse. Through her bravery and compassion, Irene ultimately helps to transform the Goblin, showcasing the power of love and understanding in overcoming challenges.