Sports presenter and broadcaster Clare Balding has always been curious about her maternal great-grandfather and the 'thing that has been sort of whispered in the family - could he have been gay?' Getting to the truth of the matter is a challenge when all the evidence comes from a time when homosexuality was illegal.

Digging into her father's side of the family takes Clare to New Jersey and New York, where she uncovers an extraordinary dynasty and American roots stretching back generations.