Bloodfever ~ Karen Marie Moning

this is the second book in the Fever series. Mac is in Ireland looking for her sister's murderer, she had been drawn in to a world that she had no clue existed. A world inhabited by Vampires, Selie and UnSelie, and many other preternatural beings, all hunting for items that Mac seems to be able to sense. Now she is trying to survive, and keep anyone else from being killed.