Paradox — P. Michael Henninger

This is the fourth book in the "Rick Grey/Return from Casablanca" series. Ari Levy is now a ghost operative for Mossad. Most of the world believes him to be dead, including his wife Anya, and his family. Only his Mossad handler, and former CIA operative Rick Grey know the truth. Ari "specializes" in specifically targeted assassinations. His most recent target assignment is one with global implications, and his most risky one yet.