Hiram Johnson is a policeman who decided to use his investigative skills on his own family. He set out to find who his grandfather was but what he discovered was a killing that changed the course of his African-American family's future.

Hiram's written a book about his journey called: Reason to Fight: A Search for Truth.

Presenter: Emily Webb

Producer: Maryam Maruf and Saskia Edwards

Picture: Hiram Johnson holding a photo of his father

Credit: Courtesy of Hiram Johnson