You can ask your students to introduce the characters physically, morally.
You can make them summarize each chapter then the general plot.
You can focus on the chronology of the main facts, their causes and their cons�quences.
You can ask the students to express their feelings explaining why they like or dislike one element, one character... And if they dislike something what they would change.
You can ask them to imagine a following episode.
You can ask them to translate easy extracts to introduce the book to foreign penpals (in a blog for example).
Let them imagine they were asked to give their opinion as a literary critic by a Publisher.
They may imagine how to promote the book (posters, on tv, on radio...)
They might be asked to prepare a lecture about the book and have to perfectly imagine the questions that the public could ask.
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Here are some ideas.