"At one point, there were two cars chasing us and I was having a sort of meltdown, terrified," the Oscar winner revealed.
The disappearance of teenage twins Holly and Dylan Meredith takes centre stage in this new drama.
Five shows are shortlisted for the inaugural Bruce Forsyth Entertainment Award.
'Television at its best should be a mirror that we hold up to see ourselves.'
There was also a special award for former 'Bake Off' judge Mary Berry.
Don't worry: This article is totally spoiler-free.
It's all over, and now we know.
There's been a surprising amount of humour this series too.