The film begins with a flashback to Day 1 of the alien invasion, providing a glimpse into the chaos that initially engulfed the town. This sequence is intense, showcasing how the creatures’ arrival instantly disrupted everyday life and set the stage for the silent struggle that would follow. This opening not only builds suspense but also offers insight into the characters’ lives before everything changed.

Back in the present day, the Abbotts—Evelyn (Emily Blunt), her teenage daughter Regan (Millicent Simmonds), her son Marcus (Noah Jupe), and her newborn baby—are forced to leave their now-destroyed home. Armed with the knowledge that the creatures can be weakened by high-frequency sounds, thanks to Regan’s cochlear implant, they embark on a perilous journey to find other survivors. The stakes are higher than ever as they must remain completely silent, with the added burden of protecting a baby, who cannot be quieted.

The family soon encounters Emmett (Cillian Murphy), an old friend who has become hardened and cynical after losing his family. Emmett’s character brings a darker, more jaded perspective on survival, contrasting with the Abbotts’ hope and determination. Though reluctant to help at first, Emmett eventually joins Regan on a mission to spread her life-saving knowledge of the creatures’ weakness to other survivors, embarking on a suspenseful journey through hostile territory.