Chronicles of Nathan Lamb: The Unparallel

Nathan Lamb and his team are called into action again in the second
book of The Chronicles of Nathan Lamb.
His friend, Yanni Seraphim, an FSB agent from Russia, also plays a
prominent role in this tale. Yanni has discovered that some agents
in his own outfit are selling out to Russian terrorists.
Once he uncovers their scheme, he is framed and placed into the
infamous Russian Black Death Prison. His wife Nina, who is also an
FSB agent, struggles to survive and protect her two children.
The stakes get even higher when Sirvo, a Russian terrorist, begins
experimenting on humans, with Yanni as one of his subjects.
After becoming one of Sirvo's pawns, Yanni somehow escapes his
diabolical scheme and flees to the United States. Once there, he
enlists the help of Nathan, knowing that he can't trust anyone in
his agency.
Join Yanni and Nathan as they work together to battle kidnappers,
gangs, pirates, terrorists, and a demon in this thrilling tale.