Yesterday's Memory — Patricia Robertson

Sister Kate Lewis's life had been badly disrupted six years before when she had loved and lost Simon Blake. Now a visiting consultant from Canada who was spending time at the Bramleigh Hospital in Edinburgh had the same name. Since the first Simon had gone to Australia, it couldn't be the same man, this one didn't look or behave in the same way at all. Besides, apart from a certain hostility towards her, he showed no signs of recognising Kate, so what was there to worry about.