Another superb novel by Len Deighton, Spy Line is vigourous and sleazy, psychologically complex and action-packed. And it is always exciting. The Daily Mail. Spy Line is a 1989 spy novel by Len Deighton. It is the second novel in the second of three trilogies about Bernard Samson, a middle-aged and somewhat jaded intelligence officer working for the British Secret Intelligence Service (MI6).