Twisted Fates by Geza Tatrallyay

Crime novelist, Greg Martens, and his wife, former Interpol agent Anne Rossiter, are once again called back to Vienna by Anne’s former boss at Interpol because Julia Saparova has disappeared a second time. Afraid that the same evil men, Sergei and Boris Polyakov, Julia’s own cousins, are behind her disappearance, Greg and Anne reenter the seedy underworld of the Russian mafia, sex-trafficking, black market arms dealing, and international terrorism, in hopes of rescuing Julia. But this time, their enemies are expecting them, and Anne stumbles into a trap, joining Julia in depraved captivity. Now the two women’s only hope is that Greg and their friends in Interpol can locate and rescue them before it’s too late—not only for them, but for the world at large…