I know Benjamin’s new business is in trouble, that he desperately needs your money. I saw the way Gwyn looked at him at your wedding reception, finding any excuse to be close, to laugh too loudly at his jokes. After all, she always wanted your perfect life. But don’t worry, Madeline. I won’t let it end like this. I can see everything from my place in the shadows between the trees. With their house lit up, they are on display. I’ll bide my time and worm my way into their home, their lives. They will never know the truth about who I am.

Thirty-three-year-old Abby Stern has made it to a happy place. True, she still has gig jobs instead of a career, and the apartment where she’s lived since college still looks like she’s just moved in. But she’s got good friends, her bike, and her bicycling club in Philadelphia. She’s at peace with her plus-size body—at least, most of the time—and she’s on track to marry Mark Medoff, her childhood sweetheart, a man she met at the weight-loss camp that her perpetually dieting mother forced her to attend.

Katelyn smiles around at her husband and friends, gathered to celebrate her 36th birthday in their beautiful home decorated with fairy lights. But the next day Katelyn wakes up shaken and terrified in a hospital bed. She doesn’t remember the sweet taste of birthday cake icing, or how angry her best friend was at midnight, or the terrible things her husband said. She doesn’t remember the party at all. When she asks her husband what happened the night of the party he says "nothing". But her blood runs cold at the way his voice lilts slightly. The way it always does when he is lying.

Amy Mackenzie is on the up. Her florist business is thriving, with a roll call of wealthy clients. And none are more glamorous than architect James Elliott and his beautiful wife, Eleanor. But try as she might to become part of their world, Amy is always on the outside looking in. Hired by the couple to provide the flowers for a lavish party, Amy sees an opportunity to have the kind of lifestyle she's always dreamed of. But when a guest suffers a violent and shocking death, the finger of blame is soon pointing at Amy.

The cherry blossoms are in full bloom in Washington, D.C., and the Calhouns are in the midst of hosting their annual party to celebrate the best of the spring season. With a house full of friends, neighbors, and their beloved three adult children, the Calhouns are expecting another picture-perfect event. But a brutal murder in the middle of the celebration transforms the yearly gathering into a homicide scene, and all the guests into suspects.