Heartstar  (English, Paperback, Thompson Elva)

Emma Cameron was a normal woman until the mysterious, otherworldly Trevelyan arrived in her life and turned it upside down. Trevelyan told Emma that she was actually a faerie being who had taken human form to undertake a desperate mission. She and her friends must now travel to the country home of the wealthy Giles Kingsbury, a satanic paedophile. Kingsbury plans to hold a Sabbat at his estate, intended to summon the arch-demon Zugalfar with the aid of human sacrifice and a stolen sapphire star-gate that will open the Gates to Pandemonia. Pledged to retrieve the sapphire, Emma and her friends arrive undetected but are soon noticed and must escape with the sapphire or be killed. Now, the coven is on the hunt for Emma. With the help of a cop whose daughters were sacrificed, she and her brave team fight off black magic and worse. As events escalate, they are catapulted into a nightmare of magic, rape, and murder. No one can be prepared for supernatural attacks and sorcery, but to save the world, Emma and her friends must stand together and fight the forces of evil.