My rating: 2 of 5 stars
Reasons why i read this book:
1. Reading from the synopsis on its back, it has uncommon theme. Yes, it is about romance, but not the cheesy one since it has some mathematical curves and equations.
2. It has nice design cover. The yellow, green, blue and the purple color of the sketch are match to each other
When finished the book, i was disappointed. I expected more stories about the 19 Katherines.