Kate lives a secluded life—until her troubled daughter shows up, frightened and covered in someone else's blood. As Kate unravels the shocking truth, she learns just how far a mother will go to try to save her child.
| Actor | Role |
|---|---|
 Julianne MooreKate Garrett | Kate Garrett |
 Sydney SweeneyClaire Garrett | Claire Garrett |
 Domhnall GleesonJackie | Jackie |
 Kyle MacLachlanRichard Garrett | Richard Garrett |
 Fiona ShawLeslie Oliver | Leslie Oliver |
 Edmund DonovanRyan | Ryan |
 Rebecca CreskoffEmma Hanway | Emma Hanway |
 Audrey Grace MarshallMallory Hanway | Mallory Hanway |
| SStella ChiveeHarper | Harper |
 Albert JonesDetective Ballard | Detective Ballard |
 Katya CampbellAudrey | Audrey |
 Melanie Nicholls-KingJoan | Joan |
 Jared CanfieldPark Ranger | Park Ranger |
| JJohn FinnRandy | Randy |
| EEphie AardemaYoung Mother at Beach | Young Mother at Beach |
 Kristina Valada-ViarsPatty | Patty |
| TTaylor Nicole KaplanTeenage Girl - Boat Rental | Teenage Girl - Boat Rental |
 Luciana VanDetteHannah | Hannah |
| MMax Ryan BurachKid #1 | Kid #1 |
| AAnnie CarrasKid #2 | Kid #2 |
 Donald J. Hewitt Jr.Detective #1 | Detective #1 |