One of the last great Titanic mysteries solved

Two-year-old Loraine Allison was believed to be the only child from first or second class who went down with The Titanic. But in 1940 a woman called Helen Kramer claimed to be Loraine Allison and heir to the Allison fortune. Professor Tracy Oost, a forensic scientist in Canada, leads the Loraine Allison Identification Project and talks about the DNA testing which has shown Helen Kramer's story to be a hoax.