Iris has returned home bruised and heartbroken from the front, but the war is far from over. Roman is gone, lost behind enemy lines, with no memory of his past, or Iris. Hoping his memories return, Roman begins to write again – but this time for the enemy. When a strange letter arrives beneath his wardrobe door, he strikes up with its mysterious yet hauntingly familiar author. Iris and Roman are drawn together by their words once more only for the war to demand the greatest sacrifice: their hearts.