The last time we saw the women of Big Little Lies-Madeline, Celeste, Jane, Renata, and Bonnie-their children were five years old. If someone wasn't invited to a birthday party, feelings were hurt. But ten years have passed and the kids are in high school, navigating all of the drama that accompanies teendom (goodbye playdates, hello drugs, sex, and alcohol). When the high school principal receives a threatening package in the mail, word quickly spreads throughout the community and parents are in an uproar. But Madeline, Celeste, Jane, Renata, and Bonnie have other things to worry about. Celeste's mother-in-law, Mary Louise, is behaving oddly-is it old-age forgetfulness and bluntness or something more sinister? Madeline is facing perhaps the biggest challenge of her life, Jane is at a dangerous fork in her marriage, Bonnie has realized there's only so much solace in yoga. And Renata? Renata is living her best life-revenge is sweet. When a stranger begins lurking around the school asking supposedly innocent questions, this tightly connected group of women must finally face the full repercussions of the big little truths they have and haven't shared with their kids. Because the stakes are now much higher than not being invited to an ice-skating party-and the ice has never been thinner for any of them.