For Whom the Wedding Bells Toll. Thaumatology, #11

Twill had always had an enigmatic side. She seemed nothing more than a housekeeper, all be it a fairy one with secrets, but things are rarely as they seem. When dragons threatened her friends and the entire human world, Twill revealed herself as Gloriandel Wintergreen, daughter of a powerful fae family who ran away from an arranged marriage a century ago, and now she has returned. Ceri, Lily, and Michael, invited to the wedding, are determined to stop it, but things are never as simple as planned.
Soon they are embroiled in politics, intrigue, murder, and a rebellion which threatens not just the fae Otherworld, but the human world as well. Can they prove their own innocence and save the world. again?