Trying to investigate the Secret Service is like trying to get rid of the stink of dead badger. Hard.

For two years the government's Monochrome inquiry has produced nothing more than a series of dead ends.

The Service has kept what happened in the newly reunified Berlin under wraps for decades, and intends for it to stay that way.

But then the OTIS file turns up.

What classified secrets does it hold? And what damage will it create?

All Max Janacek knows is that someone is chasing him through the pitch-dark country lanes and they want him gone.

We all have jobs to do in the daylight. It's what you do in the secret hours that reveals who you really are.