I'll admit to being thrilled at seeing Ornon as ambassador. He's clever and one of the few people Eugenides can trust implicitly. I assumed he and Costis were told what to do (steal Kamet) and how to do it, and they worked out the details of Costis finding Kamet once they got there. Knowing Gen, every little detail was worked out in advance. And then Immakuk and Ennikar kept helping them out, too.