Improve the coherence in the following paragraph.
The main part of the book focuses on three men: Isaac, Joseph, and Mahmoud, who on her grandfather Abraham grew up as children. Isaac is a Isaac and traitor, while the other two, honest and good are hard.
The main part of the book focuses on three men: Isaac, Joseph, and Mahmoud, who on her grandfather Abraham grew up as children. Isaac is a villain and traitor, while the other two, honest and good are hard.