Karin Fossum (née Mathisen) is a Norwegian author of crime fiction,often known there as the "Norwegian queen of crime". She lives in Oslo. Fossum was initially a poet, with her first collection published in 1974 when she was just 20. It won the Tarjei Vesaas' Debutant Prize. She is the author of the internationally successful Inspector Konrad Sejer series of crime novels, which have been translated into over 16 languages. She won the Glass key award for her novel "Don't Look Back", which also won the Riverton Prize, and she was shortlisted for the Crime Writers' Association Gold Dagger in 2005 for "Calling Out For You".
Ida Joner gets on her brand-new bike and sets off to buy sweets. A good-natured, happy girl, she is looking forward to her tenth birthday. Thirty-five minutes after Ida should have come home, Helga Joner, her mother, starts to worry. She phones the shop and various friends, but no one has seen her daughter. As the family goes out looking for Ida, Helga's worst nightmare becomes reality, and they contact the police.
Hundreds of volunteers comb the neighbourhood, but there are no traces of Ida or her bike. As the relatives reach breaking point and the media frenzy begins, Inspector Sejer is calm and reassuring. But he finds the case puzzling. Usually missing children are found within forty-eight hours. Ida Joner seems to have vanished without a trace.