Private Games by James Patterson

This book takes place in London during the 2012 Summer Olympics Games. Peter Knight is a Private agent hired to take responsibility of the Games’ security, but all goes downhill as Cronos, a self-acclaimed “instrument of the gods” who sets out to “purge” the games. His so-called purging turns into a killing spree of coaches and athletes, and as the story unfolds, Cronos reveals his past…

The story takes Cronos’s point of view, but focuses mostly on a third person about Peter’s actions and attempts to stop Cronos.