The Istanbul Signal. Marcus Vane Series, #3

For readers of John le Carré, Daniel Silva, and Mick Herron. Three weeks before she could switch on the most secure communications network the West had ever built, Dr Elif Sahin - one of the finest cryptographers of her generation - was found face-down in the Bosphorus. Officially, an accident. But Sahin was a swimmer, and in the last six hours of her life she saved sixty-eight pages, four times over, to a place no one was meant to look.
Marcus Vane comes to Istanbul to read what a dead woman refused to take to the bottom of the strait with her - and finds a signal buried inside the system itself, and a second layer to a conspiracy he thought he had already understood. The Istanbul Signal is an atmospheric, cerebral espionage novel about the people who see the truth first and are silenced for it. Book Three of the Marcus Vane series.