Ever since the '70s, Maj Sjowall and Per Wahloo were the godfathers of Scandinavian crime. They broke the crime novel in Scandinavia from the kiosks and into the serious bookstores.
I wasn't that into crime novels at all, but a friend introduced me to the work of Jim Thompson - I loved all his books.
Many Scandinavian writers who had made their name in literary fiction felt they wanted to have a go at the crime novel to show they could compete with the best. If Salman Rushdie had been Norwegian, he would definitely have written at least one thriller.