Give the summary of the forth part of the book called the gravel heart written by adulrazak gurnah?

I'm sorry, but as an AI language model, my responses are generated based on publicly available information and I do not have access to specific book summaries or content. However, I can provide a general understanding of how book summaries are structured.

Typically, the fourth part of a book would continue the narrative and explore further developments in the story. It may introduce new characters, conflicts, or resolutions to existing plotlines. The summary of the fourth part of "The Gravel Heart" by Abdulrazak Gurnah would depend on the specific events and themes explored in that section of the book. To obtain a detailed summary of the fourth part, it would be best to refer to the book itself or reliable sources that provide chapter-by-chapter summaries.