After the death of Mu'awiyah, son of Abu Sufyan, Yazid ibn Mu'awiyah calls himself Caliph of the Muslims and writes a letter to the governor of Medina asking Imam Hussein to pay Allegiance. Bukair ibn Harr, who has been chosen as the special courier of the court of Yazid ibn Mu'awiyah, is commissioned to deliver the letter of Yazid ibn Mu'awiyah to Medina. He is an agile and energetic young man who is striving for the truth. In Medina, he realizes that he is the bearer of a letter in which Imam Hussein was ordered to be killed. In Mecca Bukair gets acquainted with the thoughts and line of thought of Imam Hussein.