What a complete shock. Two years ago, a 20-year-old student at the University of Cambridge collapsed and died without any warning signs while hiking in southern France — and now her family is doing everything possible to prevent others from experiencing this same type of unexpected tragedy. Clarissa Nicholls had arrhythmogenic cardiomyopathy , or ACM, a rare heart condition that occurs when the heart muscle is replaced by both scar and fat. ACM caused the student’s heart to go into cardiac