Lennon is a seventeen-year-old girl whose has just suffered the worst loss of her life. Lennon's older sister, Bailey, died of a sudden cardiac arrhythmia just a month before the novel begins. As Lennon tries to deal with this loss, she returns to school and something like a normal life. However, nothing really seems normal to Lennon anymore.
Lennon and her sister were abandoned by their mother when they were toddlers. For this reason, Lennon and Bailey were closer than most siblings usually are. Bailey, a nineteen year old college student, was just beginning her life and planning a future that Lennon soon realizes that she knew nothing about. Each revelation causes Lennon to wonder just how close she and Bailey really were. Then, when Lennon realizes her sister was searching for their long lost mother, Lennon finds herself in a whirlwind, unsure what to do or who to trust.
To add to Lennon's grief, she finds herself drawn to Toby, Bailey's boyfriend. The two seem to feel the same degree of grief and are dealing with it in basically the same way, making it easy for them to do it together. However, grief leads to passion, compounding Lennon's confusion. To add to the mix, a new boy at school suddenly finds Lennon fascinating and confesses to a desire to be her boyfriend. Lennon, who has never had a boyfriend before, has two boys that she is drawn to and unable to choose from. Only disaster can make Lennon face her own shortcomings and help her realize where she wants to be and with whom.
