The explanation of theme should you NOT include in a summery for a book review.
A summary is a record in a reader's own words that retells the main points of a piece of writing including a newspaper article, the chapter of a book, or even a whole book. A summary omits details, and does not include the reader's interpretation of the original piece of writing.
A good summary should provide an objective outline of the whole piece of writing.
1. Therefore 2. All in All 3. However 4. In spite of 5. For example 6. Nevertheless 7. Simply because 8. In addition 9. For instance 10. For this reason 11. Further 12. Given These points 13. Along with 14. Indeed 15. That is Bonus: Morever