Poppy, Lily, and Belladonna would do anything to protect their best friend, Raven. So when they discovered he was suffering abuse at the hands of his stepmother, they came up with a lethal plan: petals of poppy, belladonna, and lily in her evening tea so she'd never be able to hurt Raven again. But someone got cold feet, the plot faded to a secret of the past, and the group fell apart.

Three years later, on the eve of Raven's seventeenth birthday, his stepmother turns up dead. But it's only belladonna found in her tea, and it's only Belladonna who's carted off to jail. Desperate for help, Belle reaches out to her estranged friends to prove her innocence. They answer the call, but no one is prepared for what comes next.

Now, everyone has something to lose and something equally dangerous to hide. And when the tangled web of secrets and betrayal is finally unwound, what lies at its heart will change the group forever.