故事发生在伦敦一家乡村医院,一位邮递员在手术的过程中离奇死亡,参加这次手术有医生和护士,这位邮递员的死因是什么?凶手就藏在那几位医护人员之中,到底是谁呢?他的做案动机是什么呢?最后的谜团由一位来自精明的警方调查员为你一一解开……In a rural English hospital during WWII, a postman dies on the operating table. One of the nurses states that she has proof of who the murderer is. The facetious Inspector Cockrill suspects one of the five doctors and nurses who were in the operating theater to be the assassin. But four poisonous pills have disappeared....