This is not the final book in this series. Titling it after the series. Titling it as I have seems to have caused some confusion in this respect. The title merely reflects Tess's new job.
Having barely survived an attack by a harpy assassin Tess decides to take some time off and investigate the property left to her by her previously unheard of Aunt Lila. She takes her friends and plans a weekend trip to figure out what to do with it, but once they arrive it doesn't take long to weird Gladys out. Tassels that move without a breeze. Carnivorous creatures in the kitchen. Fairies saving Spinners from certain death—of course Gladys sees a bird catch a spider. Tess discovers a canvas with a unicorn half stitched and takes it along. And if that isn't enough, how do you explain that the upstairs hallway which had four windows on the walk-around has twenty-five rooms in it, and the thirteenth doorway is blocked off with a wall of solid stone.
At Gladys's urging they leave the house and stay the night in a local motel in a town that isn't even on the map.
Johnny sticks it out like the White Knight he is and after they take Gladys and Carl home starts asking Tess questions she can't answer. Except this time she plans to go back to live there and she gives his father an ultimatum Tell him what he is or she will. He's already seen a fairy, she refuses to rewind that clock.
They move to Saralon and the adventures begin before they even take up residence culminating with a face to face with the witch who killed her parents.