Thereza Rowe is a Brazilian-British artist living in London. Of Hearts, her first book, she says that inspiration for the story came at a particularly hard time in her life: "Suddenly came a wee voice saying, ‘Whatever happens, never lose your heart. Everything is going to be just fine.’ That’s when I started doodling Penelope. I think of myself as a fox sitting on a cliff, and I wondered what would happen if I really lost my heart."