Talking to the Moon

Iris's grandmother, Mimi, has started to put jam on her scrambled eggs and tie blue ribbons around her fingers to remind her of stuff. Her house, always full of things, is becoming harder and harder to navigate, and when Iris goes to stay, she feels as if a whole life is becoming muddled up. As her grandmother's memory fades, a mystery is uncovered. Who is Coral, and what happened to her?