The landline rings as Agneta is waving off her grandchildren. Just one word comes out of the receiver: 'Geiger'. For decades, Agneta has always known that this moment would come, but she is shaken. She knows what it means.

Retrieving her weapon from its hiding place, she attaches the silencer and creeps up behind her husband before pressing the barrel to his temple.

Then she squeezes the trigger and disappears - leaving behind her wallet and keys.

The extraordinary mu ...