As most thrillers go, its not a happy event that happens, Froggatt laughs.
She won a Golden Globe and nabbed three Emmy nominations for her performance on the beloved period drama.
I had never done a thriller before, Froggatt says.

Joss Barratt/Sundance TV
Its very cool, its very cinematic.
The duo tell EW they wanted to do something a little more linear after two seasons ofThe Missing.
I would say, tonally, its different, Harry says.
But it does have those twists and those turns and surprises along the way.
Its not something thats too open-ended its a whole story, and a real roller coaster of a story.
Adds Jack: Youll get hooked.
And he wouldnt lie, would he?
Liarpremieres Wednesday at 10 p.m.