Max has always been close to his grandfather. He spent his summers at Gramps' estate, learning most of what he knows from him.When Gramps suddenly passes away after being ill for a short time, he leaves the estate, a beloved train set in the attic that Max and he built together, and a massive fortune to Max and his wife, Courtney.When Max and Courtney move into the mansion, Max quickly starts seeing and hearing something upstairs. The staff and Max's estranged father tell him he's crazy and that his grandfather was unwell. They tell him there is no monster. But Max knows what he's seeing. He knows something isn't right upstairs.Upstairs is a chilling tale of how Max tries to convince everyone he isn't crazy, even as he sees visions of his deceased grandfather and fights to stop a monster from killing him or the people he loves.Upstairs blends family drama and psychological terror in a way you likely haven't experienced before.