Hitomi Yoshida is a business psychologist tasked with monitoring and counselling Riva Karnovsky with the goal of getting Riva out of her slump and back as an active high-diver.
Hitomi sits in her own apartment watching Riva through numerous surveillance cameras in Riva's apartment. She has data analysts search through blog posts, papavids and other media to give her more data, and logs minute observations about Riva's body language and state of mind. Riva is not aware that she is being watched until late in the novel.
When Riva leaves the apartment, Hitomi uses GPS tracking, facetag (TM) and other facial recognition tools to track Riva's movements and watch her through public surveillance cameras.
For the first part of the novel, the surveillance works flawlessly and Hitomi can track Riva in great detail.