It’s 1976. The day of Roxanne’s birthday. 

All of her friends are at her sleepover party, but they’re more concerned with the arrival of the cool new girl in town, Evie... Roxanne’s crush.

As they vie for Evie’s attention, Roxanne’s best frenemy, Val, gets her period for the first time.

 

She flips the embarrassment into power, turning their friend group to her side and against Roxanne. While the party hobbles on, strange feelings grow inside Val and Roxanne:
Roxanne’s terror-inducing love for Evie and Val’s equally terrifying new bloodlust.

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Throw in a séance that goes off the rails, emotions rising higher than adolescent hormones, and a bathroom confrontation that turns into a bloodbath...

this night will surely change the lives of these preteens forever.