Diana Raitt is not your average high school student. A year ago she had a heart transplant that changed her life and also seemed to change her personality. When she goes missing, there are a list of people that may be to blame. Did her bitter ex-boyfriend, who's been blogging about her drastic shift in personality get into some sort of altercation with her? Or did something happen to her the night she decided to do ecstasy at a party? Ultimately, Diana's curiosity about the boy whose heart saved her life might end up killing her in the end. The team's investigation is that much more difficult given that Jack is in the hospital fighting for his life.