Susannah Cahalan, an up-and-coming journalist at the New York Post becomes plagued by voices in her head and seizures, causing a rapid descent into insanity.
Chloë Grace Moretz
as Susannah Cahalan
Thomas Mann
as Stephen Grywalski
Richard Armitage
as Tom Cahalan
Carrie-Anne Moss
as Rhona Nack
Jenny Slate
as Margo
Tyler Perry
as Richard
Alex Zahara
as Allen
Jenn MacLean-Angus
as Giselle
Ken Tremblett
as Senator
Navid Negahban
as Dr. Najjar
Robert Moloney
as Dr. Ryan
Agam Darshi
as Dr. Khan
