Óscar Mauregui

X arrives in a small town and witnesses a violent act; Z takes the job of a dead manager and discovers that he had a notebook written in code and a map; H is hired to go down a river and investigate a series of mysterious monoliths built on the shore.

Roque starts University in Buenos Aires but he is not particularly interested in attending classes or working towards a degree. Instead, he dedicates his time to one of the many groups vying for control of the university, motivated less by grand political ideals than by a wish to get close to Paula, an attractive young teacher heavily involved in internal university politics.