An assumed to be crazy ex-girlfriend finds herself seeking revenge on her novelist boyfriend for writing lies about her in his newest novel. Along the way, she begins to question her life and mental health but is pushed back on track by a helping hand.

Peach is an ordinary teenage girl with a wonderful family, but one cold February morning, her whole life falls apart. Nineteen students at Lancaster high have been shot and killed by an unknown armed student. One particular victim is Peach's younger sister, Alina. Peach takes the murder into her own hands by investigating everything and putting it into her diary, discovering what really happened on February eleventh.