High school student Arthur plays trombone in the marching band, busses tables at the local Chinese restaurant and avoids his squabbling parents. At work, he flirts with Annie, who used to be his baby-sitter. Annie is trying to build a new life for herself and her daughter after splitting with high school sweetheart Glenn. A man with a troubled past, Glenn hopes to make a new start by getting a job and reconnecting with his family. At school, Arthur meets a pretty girl, Lila, who is just as nerdy as he is, and they quickly develop a crush on each other. Though Lila makes her feelings for Arthur painfully obvious, Arthur is reluctant to accept her advances as he watches his father move out of the family home while his mother struggles to keep things together. Determined to find happiness, Arthur begins to fall for the irresistible Lila, even as he witnesses Annie and Glenn tear each other apart in a series of distressing encounters at the same time as his parents begin separate lives. Then, on a cold winter morning, Glenn and Annie's past catches up with their future. In one shocking moment, all of the pain and struggle comes to a screeching halt. For them, and for everyone who knows them, nothing will ever be the same.