A possible concise summary is:
Preeti is an unhappy and unfaithful wife who despises her husband Pankaj and his mother. She has an affair with her sister Kusum's husband Rohit, who is also unhappy with his marriage. They plot to kill Kusum and frame Pankaj for Preeti's murder by using a corpse that resembles her. However, their plan is foiled when Preeti's mother finds out the truth and exposes them to the police. Preeti and Rohit are arrested and disowned by their families.
Here are some key facts extracted from the text:
1. Preeti is married to Pankaj, but she is unhappy with him and his mother.
2. Preeti is attracted to Rohit, who is her sister Kusum's husband.
3. Preeti and Rohit have an affair and plan to kill Kusum and frame Pankaj for it.
4. Preeti fakes her own death by using a corpse that resembles her and wearing her clothes.
5. Pankaj is arrested for Preeti's murder, but he is innocent.
6. Kusum finds out about Preeti and Rohit's affair and tries to expose them, but they attack her.
7. Preeti's mother Usha also learns the truth and confronts Preeti and Rohit.
8. Preeti and Rohit are arrested by the police and Usha disowns Preeti.