In high school, a group of notorious friends buried a secret and promised to take that secret to their graves, they part ways never to see each other again. Five years later they are all brought back together, they're lured to a campsite by a mysterious person in a yellow hoodie and there they receive a message - one only they can understand. Someone knows what happened on the night of August 15th and that person has vowed to make their lives miserable. Together, they need to find out who that person is so that their secret can never come to the surface. When one of them gets hurt, everyone is a suspect. They can't trust each other and they certainly can't trust anyone around them.

For months Summer is trapped in a cellar with the man who took her - and three other girls: Rose, Poppy, and Violet. His perfect, pure flowers. His family. But flowers can't survive long cut off from the sun, and time is running out...