vinge ( wahlstromandwidstrand , 1988 ) ; secret forces by jan ottosson and lars magnusson ( tiden , 1991 ) ; power struggle for sapo by erik magnusson ( corona , 1989 ) ; an assignment by carl lidbom ( wahlstromandwidstrand , 1990 ) ; and - somewhat surprisingly - an agent in place by thomas whiteside ( ballantine , 1966 ) , which dealt with the wennerstrom affair .