Creative Spirit: A Supernatural Thriller by Scott Nicholson
Amazon US $0.99
I believe @ZodWallop mentioned this one after talking about Jonathan Janz's The Dark Game.
When artists gather at a remote Appalachian estate for a retreat, they are unaware that their energy is feeding something unwholesome. Sculptor Mason Jackson and dying parapsychologist Anna Galloway must uncover the dark secrets of Korban Manor before their spirits become trapped forever.