A banker with a talent for memorizing numbers is recruited by a mobster looking to get ahead.

聚焦美国“暴徒时代”黑手党头目艾尔·卡彭。故事从这位经历了十多年牢狱生涯、已经47岁的黑手党教父讲起，此时的艾尔·卡彭饱受老年痴呆症困扰。