The last thing 16-year-old Jessie Sloane wants to do is call an ambulance. Especially since no one believes she’s sick. Not the dismissive doctors, who claim it’s all in her head. And not her lovesick mother, who always sides with her suspicious boyfriend.

But if Jessie can figure out what’s causing her mysterious illness, she can flip the switch on her isolated life and start living like the Glitter Girls – parties, dances, endless sleepovers. 

Desperate for answers and to prove she’s not a faker, Jessie doubles down on medical research in the library. At home, the quiet sleuth uncovers dark secrets about her mother’s live-in boyfriend. When her perfect sister heads off to college, and her own mother turns on her, Jessie has no choice but to leave home and move in with a grandmother she barely knows. For the first time in years, Jessie feels good. She’s even going to her first formal. But just when Jessie starts to think that maybe the doctors were right, the chaos of her illness returns, and Jessie finds herself trapped. In a race against time, Jessie must expose the truth about her illness – and her mom’s boyfriend – before she’s silenced for good.