the ending (spoilers)
im sure someone out there besides me has noticed that it had the same resolution as For Your Eyes Only. piece of hardware wanted by both the russians & the allies, comes down to a mexican standoff. the allies destroy it rather than let the russians have it. no one wins, no bloodshed.
two similar endings by two legendary authors. altho FYEO was written in 1960, ISZ was written in 1963.
Oh, so that's what an invisible barrier looks like - Fidgit