Twelve-year-old Iris has been sent to Spain on a mission: to make sure her elderly and unusual aunt, Ursula, leaves her fortune and her sprawling estate to Iris's scheming parents. But from the moment Iris arrives at Bosque de Nubes, she realises something isn't quite right. There is an odd feeling around the house, where time moves slowly and Iris's eyes play tricks on her. While outside, in the wild and untamed forest, a mysterious animal moves through the shadows. Just what is Aunt Ursula hiding? But when Iris discovers a painting named Iris and the Tiger, she sets out to uncover the animal's real identity putting her life in terrible danger.