A good book summary should include the main characters, the setting, and a brief explanation of the plot. The main characters are like the stars of the story, and it's important to know who they are and what they do. The setting is where the story takes place, like a magical kingdom or a spooky forest. The plot is what happens in the story, like a brave knight fighting a dragon or a magical adventure to find a lost treasure.
It's also important to include the main problem or conflict in the story, because that's what makes the story exciting. Maybe the characters have to solve a mystery or fight against an evil villain. And don't forget to mention the important events or turning points in the story, like when the characters make a big discovery or when they face a really tough challenge.
Finally, a good book summary should also include the main message or lesson of the story. This is like the idea or moral of the story. It could be about friendship, bravery, or the importance of being kind. Including all these parts in a book summary helps to give a clear and interesting overview of the book.