"The Ghost Sonata" is a one-act play written by Swedish playwright August Strindberg in 1907. The story revolves around a young student who encounters a mysterious old man and a series of ghostly figures in a decaying apartment. The play explores themes of illusion, reality, and the human condition, revealing the hidden truths of the characters' lives. The characters include a wealthy family haunted by their past, represented by the ghosts that appear throughout the play. As the student interacts with them, he uncovers their secrets and the burdens they carry, ultimately leading to a deeper understanding of life and death.