The films swapped the order of the first two books and skipped the third one entirely.
The answer to the usual question depends on whether you are reading or watching. In print, start with Angels and Demons. On screen, start with The Da Vinci Code, because the film of Angels and Demons was rewritten as a sequel to it.
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Langdon's first case, and it introduces him from scratch. Nothing in it depends on anything else, and the next book refers back to it.
The one that made the rest of the series happen, and it treats the Vatican business in Angels and Demons as something that already happened to him.
If you are watching instead of reading, this is the one to start with, even though it is the second book. The films were made in this order and the next one assumes it.
Adapts the first novel but is written as a sequel: the Vatican calls Langdon in because of the Grail book he has just published, so watching it first breaks its own dialogue.
Then what? Then the 2016 film of Inferno, which jumps straight past The Lost Symbol. No film of that book was ever made. In print, carry on with The Lost Symbol, Inferno, Origin and The Secret of Secrets in publication order. The two television versions stand apart: Peacock's ten episode Dan Brown's The Lost Symbol recasts Langdon as a much younger man, and Netflix has an eight episode version of The Secret of Secrets in production that starts over again with another actor.
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