Cynthia Hill directs HBO’s four-episode docuseries about one man’s search for his missing sister.

But she never returned, nor was her body ever found.

But questions nagged at him.

Stephen Pandos HBO Burden Of Proof

Stephen Pandos in ‘Burden of Proof’.Courtesy of HBO

Why did Margie and Ron wait three days to call the police?

If Jennifer ran away, why were none of her belongings missing from her room?

“It was a tone I’d never heard your dad use before,” recalls Sharon.

Margie Pandos HBO Burden Of Proof

Margie Pandos in ‘Burden of Proof’.Photograph by Courtesy of HBO

“Believe me, if I had the answers, I’d give them to him.”

It’s a sentiment that could support a whole episode’s worth of follow-up.

“I try and understand it,” says his wife, Karen.

“I’ll say, ‘It’s not really your responsibility to solve this case.’

But he’s doing the best he can.”