Beck- In the Name of God

A paparazzi photographer is found brutally murdered. His photo studio has been ransacked. Computers and cameras are missing. Was it a robbery that went wrong?
A settling of scores for a drug deal? Or had the murdered photographer discovered and taken photos of something so sensitive that he had to be killed? The motives and the clues are very sparse. The only thing Martin Beck and his colleagues have to go on is a pen with a built-in USB-memory holding more than 100 photos. Perhaps the solution is to be found among the pictures. Margareta Oberg reacts strongly to two of the pictures and hides them without anyone being the wiser. What does Oberg actually know about the persons on the photos? And why doesn’t she say anything to Beck?