"Indian Summer of a Forsyte" is a continuation of the Forsyte Saga, a series that explores the lives of an upper-middle-class English family. The story focuses on the patriarch Soames Forsyte, who is struggling to accept the dissolution of his marriage and his unrequited love for his ex-wife Irene. His obsession with her continues to haunt him, and he is unable to move on. The narrative provides a detailed examination of the social and moral values of the Victorian era, highlighting the emotional and psychological complexities of the characters.