Kristina Georgia Snow is the perfect daughter: gifted high school junior, quiet, never any trouble. but on a trip to visit her absentee father, Kristina disappears and Bree, an alternate personality to Kristina, takes her place. Bree is the exact opposite of Kristina--she's fearless.
Through a boy, Bree meets the monster: crank. and what begins as a wild, ecstatic ride turns into a struggle through hell for her mind, her
Kristina goes to New Mexico to see her father. When she goes, the first night she meets a boy named Adam. They are instantly attracted to each other. One night, Adam shows Kristina or "Bree" crank, the monster. She says she has never felt this amazing in her life. She and Adam begin a romance until she has to go back to Nevada to be with her mother, stepfather, gay sister, and brother. However, she brings the addiction with her. She meets two boys named Brendan and Chase. They both have connections to the monster. She is so desperate for crank that she lets Brendan rape her. Chase and Kristina bond more and more and they eventually fall in love. Her addiction to crank grows when she makes friends with Robyn, a sister of Trent (a former friend of Kristina). Robyn has connections to drugs, and teaches Kristina how to smoke it. Weeks pass and she finds out she is pregnant. Chase is sure it is his baby, so he proposes to her. She finds out at the doctors office that Brendan was the father. Kristina turns down the proposal so she won't ruin Chase's life. Chase goes off to California for college and writes to her from time to time. Kristina keeps the baby and her parents help her raise it. She named it Hunter Seth. Kristina ends it with believing Bree will always be a part of her, and her addiction to crank will always be with her as well. But for now, she has quit the monster to love and take care of the baby.
The book, Glass is a sequel to Crank. It explains what happens after she gives birth to Hunter Seth.