A Summer of Murder

Oliver Bottini

Murder in Germany 2004, but Detective Louise Boni finds tentacles stretching from the Balkans to Pakistan. In addition she must face mental exhaustion plus questions about exactly how far she is willing to go 'for Germany'.
This great read is the second in a series - my only wish is that I'd read number 1 first. It's called Zen and the Art of Murder if you prefer to read things in order.

Extract

Now they had come into her apartment.
What she failed still to understand was why he was showing her his face.
The fear returned. 'Just a chat, Frau Boni.' She believed him. Perhaps she sensed they knew each other from the forest to the south of Oberried.
'I assume we're colleagues of some sort.'
He nodded.

Parallels