Kindred of Darkness — Barbara Hambly

When James Asher and his wife Lydia's baby daughter Miranda is kidnapped by the Master Vampire of London, the stakes are high: blindly follow the Master Vampire's instructions, keep out of the way of the human networks that serves the vampires, destroy the interloper who seeks to seize control of the London Nest, and find the key to the Nest's tortuous inner workings: The Book of the Kindred of Darkness.

Even with the vampire Don Simon Ysidro on their side, there's no guarantee that anything - or anyone - is who or what they appear to be. Nor is there any certainty that they'll see their child again - or survive the experience themselves.