17 year old Sara Hale has spent most of her teen years struggling with depression. Through most of her school years she has had to deal with bullying and isolation from her classmates and from her former childhood friend Alison Parker.

Ali Parker is a popular senior in high school. She's big headed and vain, and thinks little of the feelings of others. That is, until the day her life changes forever.

The death of Sara Hale comes as a shock to many kids in her high school but the person most impacted is her former bully Ali Parker, who suddenly finds herself able to see the cuts and bruises of everyone. She soon realizes that the marks that appear blue are those that she personally has caused; be it from physical or emotional trauma. This new power forces Ali to see the real impact she has on the emotions and bodies of others, and the true part she had to play in the death of Sara Hale.