The landline rings as Agneta is waving off her grandchildren.
Just one word comes out of the receiver: ‘Geiger’.
For decades, she has always known that this moment would come, but she is shaken. Retrieving her weapon from its hiding place, Agneta attaches the silencer and creeps up behind her husband of fifty years before pressing the barrel to his temple.
Then she squeezes the trigger and disappears.
Detective Sara Nowak knows this is no ordinary murder case. But she will soon discover that the mysterious codeword, Geiger, is just the first piece in the puzzle of an intricate and devastating plot fifty years in the making.