Soulstone

Witches, Werewolves, and Vampires... Oh My! Add a mystical stone and a few disembodied spirits, and you have the latest, and most exciting installment of the Immortalis series, Soulstone!
Book 4 in the Immortalis series

It's a desperate time for rookie vampire Alyssa, and her sanity is hanging by a slender thread. Her clan is still reeling from the monumental battle with Aniketos; a battle that claimed the body of Lysander, her sire and lover, and trapped his spirit in a mysterious crystal. A Soulstone.

Unfortunately, no amount of magic has been able to release Lysander's spirit, and the stone is starting to fade. Weeks of effort have proved futile. Her clan, the Peregrinus, have all but given up hope. Only Alyssa still believes her lover can be released. In despair, Alyssa begs the help of the local witch coven, and unwittingly exposes the supernaturals of Boston to unwanted attention from the Acta Sanctorum.

The Saints converge on the city and begin their cleansing crusade to rid the world of all things "Unnatural." In the middle of an all-out war, but no closer to a solution to the dying stone, Alyssa is left with an unenviable choice: save her mate, or save her clan.

http://www.amazon.com/Soulstone-Katie-Salidas/dp/0985127783/ref=la_B003APXXWO_1_2?ie=UTF8&qid=1340343890&sr=1-2