3" A Game of Zooms

This is a detective mystery. It lasts only 3 seconds. Which is enough time for a particle of light to travel 900,000 kilometres. And as you follow it on its journey - through scenes of deadly drama and seeming innocence, as far as deep space and back - look into the blind spots and corners. There are clues there: connections between the characters, motives, intrigues, crimes and plots. You are the detective. Find the solution.