The main characters in Marrowbone Ultra HD are the mother and her four children. The woman was badly beaten by her husband, so she took three sons and a daughter, and went as far away as possible. Together with her children, the lady begins a new life in the house where she spent her entire childhood. But soon the children are left alone, their mother dies of a serious illness. Before she dies, the woman takes a promise from her eldest son that he will take care of his siblings. Jack is not yet twenty-one years old, and this means that the child welfare service can come at any time to take his younger brothers and sisters. To be all together, the children hide their mother's death from others. They have to wait for Jack to be an adult. There are many rumors among the townspeople that a ghost lives in their house and something terrible is happening. One day Jack finds out the terrible mystery of the house and the fact that besides them there is a frightening creature in the building. The younger brother begins to see a ghost...