Banished: The 3rd Freak House Trilogy

An infestation of evil ghosts is too much for spirit medium Cara to handle alone. She summons Quin, and together they attempt to discover where the ghosts came from, and why they refuse to leave this realm. To protect the residents, Cara and Quin must work closely together, leading to old feelings resurfacing between them. 

But as Cara learns about Quin's mysterious past, she has more answers than questions.