“What is the object of this circle of misery，and violence，and fear？It must have a purpose，or our universe has no meaning and that is unthinkable . But what purpose？That is humanity’s great problem for which reasons so far there's no answer”這是整個劇集的最后一段話，二刷完成了。以前看福爾摩斯，主要是著重縝密思維和神奇推理，然而更是人性弱點和丑惡的鏡鑒，尤其是《訛詐莊家》《單身貴族》和這最后一集《硬紙盒子》表現得尤其明顯。