The girls of Tink, Inc., are: Merissa ("The Perfect One"), Nadia ("The Slut"), and, until last summer, Tink.
Senior year, their last year together, Merissa and Nadia need Tink more than they ever did before. They each have secrets they could share with no one but her, secrets that have become toxic and that threaten to unravel their friendship—and themselves. Tink had a secret, too, a big one, but no one knows what it was. And now she's gone.
Then, the girls hear Tink, whispering to them. Sometimes, the girls feel Tink, trying to tell them something....