Single mom Kate O'Donnell is living her worst nightmare. Her young daughter, Clara, who has a medical condition that doesn't allow her to be vaccinated, becomes critically ill when one of her classmates, Lauren-whose family chose not to vaccinate-contracts and spreads the virus. While Lauren has no trouble recovering from the disease, Clara's condition worsens. With time spent by her daughter's bedside, Kate loses her job and slides deeper into medical debt. But when another school parent points the blame at Lauren's mother, Lucy, and the media begins an attack, we see two very different views on parenting and how badly things can spin out of control when all either of these two women wanted was to keep their daughters safe.