The black widow by Daniel Silva 

Legendary spy Gabriel Allen is poised to become the chief of Israel’s secret intelligence service. But on the eve of his promotion, ISIS detonate a massive bomb in the Marais district of Paris, and a desperate French government wants Gabriel to eliminate the man responsible.

They call him Saladin. He is a terrorist mastermind, whose network communicates in total secrecy, leaving Gabriel no choice but to insert an agent into the most dangerous terrorist group the world has ever known. An extraordinary young doctor, she must pose as an ISIS recruit in waiting, a ticking bomb, a black widow out for blood.