Helene's shocking action in leaving her young son on a station platform seems inexplicable and unforgivable, until we read the rest of her story. Hers is a life typified by other emotionally traumatised families: broken and brutalised men and women driven mad by grief. Helene learns the only way to survive is to cut herself off from all feeling. That we feel empathy with her terrible decision makes the ending all the more heart-breaking.