Tess and Jake face an unusual dilemma. Their adopted daughter Aara received a huge inheritance from Tess’s nemesis, the deceased Amir al-Saadi. The fortune comes with an unsettling condition: Aara must marry into a Muslim family within one year. Suddenly, Tess and Jake must assess whether such a condition is acceptable. They meet with two Muslim families and end up in Istanbul so Aara can decide whether she wants to comply with the condition of the will. To complicate things, Amir’s sister Fadime is the trustee, and Laurent Belcour, the dissolute schemer, is now her secret lover. They crave the fortune for themselves and devise a plan to gain the upper hand. At the same time, Belcour is still seeking revenge against Tess and her team for foiling his evil plans in the past. He turns for help to ISIS, the jihadi extremist group now engaged in an existential struggle with Iraq and Syria. How will Tess and Jake meet these challenges?