Amara Shepherd has spent twenty-two years fighting cystic fibrosis and refusing to be defined by it. Then she falls for the one man she absolutely shouldn't. Mark Sloan. He's older. He's Derek Shepherd's best friend. And he's completely off-limits. But Mark is the first person who sees Amara-not her illness, not her father's daughter, not a patient. Just her. Their love was never supposed to happen. And keeping it a secret might be the only way to survive it.