Sweep with Me by Ilona Andrews

Thank you for joining us at Gertrude Hunt, the nicest Bed and Breakfast in Red Deer, Texas, during the Treaty Stay. As you know, we are honor-bound to accept all guests during this oldest of innkeeper holidays and we are expecting a dangerous guest. Or several. But have no fear. Your safety and comfort is our first priority. The inn and your hosts, Dina Demille and Sean Evans, will defend you at all costs. [But we hope we don’t have to.]
Every winter, Innkeepers look forward to celebrating their own special holiday, which commemorates the ancient treaty that united the very first Inns and established the rules that protect them, their intergalactic guests, and the very unaware/oblivious people of [planet] Earth. By tradition, the Innkeepers welcomed three guests: a warrior, a sage, and a pilgrim, but during the holiday, Innkeepers must open their doors to anyone who seeks lodging. Anyone.
All Dina hopes is that the guests and conduct themselves in a polite manner. But what’s a holiday without at least one disaster?