Colin Firth

as Michael Peterson

Toni Collette

as Kathleen Peterson

Sophie Turner

as Margaret Ratliff

Michael Stuhlbarg

as David Rudolf

Patrick Schwarzenegger

as Todd Peterson

Odessa Young

as Martha Ratliff

Dane DeHaan

as Clayton Peterson

Tim Guinee

as Bill Peterson

Juliette Binoche

as Sophie Brunet

Vincent Vermignon

as Jean-Xavier de Lestrade