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