This is not a bad spy novel, and in fact it moves along at a brisk pace and retains the reader's interest. However, this one also lacks any particularly distinguishing characteristics. It is a rather formulaic spy story, and that is pretty much the end of it.
Littell's penchant for eccentric characters is present in this novel, but here it seems somewhat contrived, and I found it irritating rather than refreshing.
My main criticism of this one is that it lacks that strong sense of authenticity that author Littell often brings to his spy novels. I just did not find this one to be particularly convincing or authentic. And unfortunately, it contains a formula that Littell has overused in any event--the notion that both sides of the Cold War were bad guys, equally unscrupulous, etc. Maybe this notion was "fresh" in the 1970s. It comes across as old and stale today. Well, times change, I suppose. A similar formula in Littell's "The Amateur" works out better.
This is a beer and chips novel for a lazy afternoon, which is exactly how I read it.