Я не из тех, кто ксивой машет — я скромный

A class reunion draws Yerkin into a maelstrom of lies: he brushes off the police, befriends a KNB officer, and promises to help Mika, a fourth-year student. He refuses to continue the evening at her apartment, but ends up there anyway. What can he tell his wife, and how can Yerkin extricate himself from this situation?