Sex and the Single Vampire ~ Katie MacAlister

this is the second book in the Dark Ones series. Christian, who we met in Single Girls Guide to Vampires, is in London for a book signing, and visiting with Joy, Raphael and Roxy. While in London, he meets Allegra, Allie for short, a Summoner there on tour, visiting haunted places in town trying to document ghosts and summon them. Allegra agrees to help Christian find a friend of his who has disappeared, and they have a great adventure.