Unit 400: The Assassins, the sequel to Cooper's Revenge, was published in 2014. In it, protagonist, Logan Alexander, is pitted against Iranian Revolutionary Guards Corps assassins bent on avenging the destruction of their terrorist training camp in Iran, and the murder of their camp commander.
The IRGC is reeling from a devastating attack on its covert training center in Bandar Dylan, Iran. In retaliation Iran's Supreme Ruler turns loose an ultra secret weapon - Unit 400. This cadre of trained assassins has its roots in ancient Persian culture, when Ismaili leader, Hassan al-Sabbah, unleashed the Hasashin from their mountain fortress at Alamut to assassinate political and religious foes.