Only We Know

What is the secret of Lauren's past?
Lauren's family have moved house very suddenly, and she and her sister Tilda have to go to a new school. Lauren's determined to reinvent herself, but she's panic-stricken when she sees Harry, who she knew a few years ago. Luckily Harry doesn't recognise her, and she knows she has to make sure it stays like that.
Lauren, unlike Tilda, settles in well. She makes friends, is he