Jodie Foster as Penelope Longstreet

Kate Winslet as Nancy Cowan

Christoph Waltz as Alan Cowan

John C. Reilly as Michael Longstreet

Elvis Polanski as Zachary Cowan

Eliot Berger as Ethan Longstreet

Joseph Rezwin as Walter (voice)

Nathan Rippy as Dennis (voice)

Tanya Lopert as Michael's Mother (voice)

Julie Adams as Secretary (voice)

Lexie Kendrick as Jogger (voice) (uncredited)

Roman Polanski as Neighbor