Derek Jacobi as Leopold Gursky

Sophie Nélisse as Alma Singer

Gemma Arterton as Alma Mereminski

Elliott Gould as Bruno Leibovitch

Torri Higginson as Charlotte Singer

Mark Rendall as Young Leopold Gursky

Corneliu Ulici as Young Bruno Leibovitch

William Ainscough as Bird Singer

Alex Ozerov-Meyer as Misha Strumann

Jamie Bloch as Zoey Schwartz

Claudiu Maier as Zvi Litvinoff

Julian Bailey as Jeff

Ines Feghouli Bozon as Little Girl #1

Maverick Fortin as Little Boy

Lynn Marocola as Ferry Person (uncredited)