Aislyn suffers from crippling shyness - that is, until she's offered a dose of Charisma, an underground gene therapy drug guaranteed to make her shine. The effects are instant. She's charming, vivacious, and popular. But strangely, so are some other kids she knows. The media goes into a frenzy when the disease turns contagious, and then deadly, and the doctor who gave it to them disappears ... An edge-of-your-seat thriller from the bestselling author of "Nerve" the book behind 2016's hottest YA film.