Lies Like Poison by Chelsea Pitcher

Riverdale meets Kara Thomas's The Cheerleaders in this electrifying, twisted thriller about estranged friends who reunite when someone commits the murder they'd planned-but didn't go through with-and leaves one of their own to take the fall.
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...

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