It was supposed to be the perfect trip. Four friends, fresh out of university, backpacking around Thailand. But among the sun, sea and sand, something went horribly wrong... In the years since, Holly has tried hard to push memories of that terrible summer from her mind. Now a schoolteacher, she believes her life is finally coming together when she meets Tom and his adoreable five year old son, Jack. But then, Holly starts receiving anonymous messages, showing photos which Holly was sure she destroyed years ago. Someone clearly knows the truth about what really happened. The only question is, how far will they go to get revenge.