No Going Back — Alex Gutteridge

Fifteen-year-old Laura gets the shock of her life when she moves to rural Derbyshire and finds the ghost of her dead father in her grandmother's home. At first Laura is overjoyed to see him, but as time passes she begins to wonder why her dad is finding it so difficult to move on, and why her mother still refuses to talk about his death. What is the secret that has been kept from her for all these years?