the impossible knife of memory by Laurie Halse Anderson

High school senior Hayley Kincain lives every day on edge.  She must walk on eggshells around her father, a veteran haunted by his wartime experiences whose escape through drinking and drugs leave him moody and unstable.  Her own past has taught her to fear trusting others and caring about anything or anyone except her dad.  Then into her life comes a charming, funny, persistent and thoughtful boy who wants to be with her and make her laugh.  Can Finn bring love and thoughts of a better future to Hayley, or is he just another distraction from her full time responsibilities trying to save her father from the ravages of his PTSD?  Great story!