Book
Traveling with the Dead
Book 2 in the James Asher Vampire Novels series.
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James Asher follows a former colleague whose secret journey east suggests an alliance between human intelligence services and powerful vampires. His pursuit takes him from London through Vienna towards Constantinople, where imperial rivalry and undead politics are becoming inseparable.
Lydia Asher and Don Simon Ysidro begin a parallel journey after discovering that James has disappeared into the operation. As the two searches converge, the Ashers must prevent a faction from turning vampires into instruments of state power while surviving alliances in which every participant expects to betray the others.