England awaits the coronation of King Charles II. London is relieved and hopeful for a better future. But England’s enemies are using the newly re-established post office for their own ends with plans to overthrow the king. There are unexplained murders and another war is possible. The king’s security advisor asks Thomas to decipher coded letters intercepted by the post office. The body count rises and the action draws closer to Thomas’ loved ones. Will he find the murderers before it’s too late?