在这部鼠行江户片中,本作是一部以江户时代的著名怪盗“鼠小僧为主人公的娱乐古装剧。泷泽饰演的当然就是”鼠小僧“次郎吉。白天是花花公子、风流倜傥的江户人次郎吉，晚上则摇身一变成”鼠小僧“，从武士家里透出装千两银的箱子，分发给贫穷的百姓。
该剧以江户为舞台背景，每集讲述一个次郎吉与妹妹小袖（忽那汐里饰）扬善除恶的故事，是一部畅快娱乐悬疑剧。
Under the rule of Shogun Ienari, the samurais and the townspeople are all discontented and grumbling about their lot in life. Amidst all these, there lives a man by the name of Jirokichi, popularly known as Nezumi Kozo. Jirokichi runs a bar with the help of his sister, Kosode. Unbeknownst to everyone, Jirokichi and Kosode are always helping the victimised weak and poor from being bullied by the evil rich.
