Rollercoasters: Unique

When Dominic finds the photo in his granddad's loft, at first he can't believe what he is seeing. How can it be possible? How can there be someone else looking so like him? And then it beings to dawn on him that this must be his brother. But why has he never been told that he had a brother? Why has it been kept secret? And what happened to him?
When his parents refuse to tell him anything, Dominic decides to find out the truth for himself. But when he starts his search, Dominic uncovers a horrifying secret and unleashes a chain of events that will have far-reaching and disastrous consequences for everyone involved.