Vampires are Forever ~ Lynsay Sands

This is book eight in the Argeneau series. Thomas is seen as the slacker in the family, he is sent on errands, and in general, treated as the errand boy, who can't be trusted on his own. Margarite has disappeared, the only one available to look for her at the moment is Thomas. So Thomas heads to London, Margaruite's last known location, to begin the hunt. While there Inez is supposed to help him in his hunt. As they follow the clue's to locate his Aunt, Thomas and Inez encounter many trials and oddities.