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At it's heart, it's very core, Don DeLillo's "Libra" is a spy caper comedy. Possibly due to the dense language, the overlapping of plots, and that constant feeling of dread and death, it's easy to see this book as a depressing evaluation of the 20th century. In a certain light, yes it is, but DeLillo gives us a bumbling protagonist who cannot keep his lies straight, a government agency within a government agency trying to sabotage another government agency altogether, a dysfunctional family that see themselves as being far bigger than their lives really amount to, and puns, jokes, in-jokes, nods, and slapstick allusions.
Yes, this is the story of Lee Harvey Oswald and all the things that happened to him before and after he assassinated the President (which he does and doesn't do, in the end). DeLillo plays Oswald as an incompetent, gullible, small little man who has all these big dreams about how the world should operate, but doesn't want to do the actual work involved. He defects to Russia, decides that the Russians aren't quite what he wants, and tries to defect back (but not after giving out a lot of useless information!), with the memoirs he wrote and is convinced that everyone will want to buy once he returns stateside.
But it's also about a government agency who wants to scare President Kennedy. It turns out Oswald is the perfect guy for them to use, and they do use him.
This is a book that has to be read more than once. Much of the fun comes in seeing how the storylines and timelines overlap and contradict each other. Just watching Oswald bumble his way through a Russian interrogation is worth picking this up for alone. And then, toward the end, when you start realizing who the story really belongs to, how all the pieces ultimately fit together, and how it could possibly play out next time, does the impact of the book really hit you.
DeLillo outdid himself with this book, and he has not been able to capture that spectacle or wonder ever since.