Robert Sheehan

Jack

Lily Cole

Emma

Joely Richardson

Psychiatrist

David O'Hara

DCI Keane

Tamzin Merchant

Emma

Andrew Tiernan

Father

Leo Woodruff

Jumping Man

Alex Wyndham

Martin

Deirdre O'Kane

Mum

Jack Fox

Mark

Rhys Connah

Young Jack

Oliver Heald

Ben

David Blair