One main theme is national identity. These novels often explore how the idea of India as a nation was formed during the struggle. For example, in 'The Great Indian Novel', different characters represent different aspects of the nation - building process.
Another theme is sacrifice. Many characters in these novels, like in 'Train to Pakistan', have to sacrifice their personal safety, relationships, or even their lives for the greater cause of independence. It shows the selfless dedication of the people involved in the struggle.
Social change is also a significant theme. IAS novels related to India's struggle for independence often depict how the fight for freedom was also a fight against social inequalities such as caste system. 'Midnight's Children' for instance, shows how the new - born nation had to deal with these deep - rooted social issues even as it achieved political independence.