Murder at the Altar — Lynn Marron

In the second book of the Mystic Triplets Mysteries , brother Noel is accused of poisoning a fellow Beluga trainer at the Aquarium. When Holly Corey starts investigating she visits her Old Craft mentors, Sarah and Abby Hoyt. Unfortunately against their advice, Holly accepts two new long term guests at the Corey Bed and Breakfast: Lilith (once a member of her father's coven ); and Lilith's younger warlock architect ( sometimes lover ) Gregory St . Clair. Lilith is pressing to buy the Old Mill that the triplets' mother ritually suicided in, while Gregory is trying to seduce Holly up on to the high altar at Grace La Fleur's Church of Nature's Bounty. Afraid of the Wiccan ritual, but needing to know more, Holly drags Sgt. Paul Travinsky up to the beginnings of the naked Yule celebrations that winds up being raided by his fellow cops. While the Sergeant is being told to stay away from Ms. Corey or give up his job, Holly finds herself in danger of losing her life--or her soul--to the combined efforts of the Rasputin like Gregory, and the powerful, mind controlling Lilith.