Eddie Redmayne

as Alex Forbes

Tom Sturridge

as Nigel Colbie

Toni Collette

as Sally

Richard Roxburgh

as McKenzie

Kate Maberly

as Susan Mueller

Jonathan Overton

as Josh

Amit Shah

as Raj Mehta

David Threlfall

as John Colbie

Cathryn Bradshaw

as Helen Colbie

Patrick Malahide

as Headmaster

Hugh Sachs

as Rev Donaldson

Liam McKenna

as Mr Fergus

Bryan Robson

as Mr Evans

Paul Sonkkila

as Police Bureaucrat

Craig Crosbie

as Coroner

Paul Blackwell

as Geoff Burns

Jordan Prosser

as Boy on Train