This was an ok book for me. Too many plotlines, too many investigations. Everything did come together in the end but it was not half as satisfactory or enjoyable as the other books. I did like Yukawa & kyohei's mentor mentee kind of relationship. But Yukawa's genius & deciphering skills were not quite on display as expected in a series named after him. Also what was the role of desmec anyway? It didn't make any sense to include a huge corporation. The equation is not accurate after all? Good read just not the best.