This is book number 4 in the Tomorrow series.
That's what war does for you. Either kills you in one hit or destroys you slowly. One way or the other, it gets you. Unless you fight back.
"Each book has its place in the tone and tenor of the series, but Darkness, Be My Friend is one of the best.... Like ancient myths, the stories confront the purpose of life, death, betrayal, killing, love, hate, revenge, selflessness, sacrifice and, in this most recent book, faith." - The Age