In the future, mysterious monsters have appeared globally, killing humans until only a few survivors remain. The Abbott family, including deaf daughter Regan, communicates through ASL while foraging in silence. With tough blind armor monsters relying on sound, a tragic incident occurs when youngest son Beau inadvertently makes noise, attracting deadly creatures and leading to his demise. The family maintains strict noise discipline in their daily survival routines, with each family member contributing to their safety measures. Lee, the father, obsessively studies the creatures, attempting to find a way to defeat them. Regan, feeling excluded from a hunting lesson, ventures out to honor Beau's memory and discovers a way to silence the noise-making toy shuttle, providing hope for a quieter existence.