I wasn't. It was a setup episode with a pretty big bang at the end. THere was a lot of to cover to catch people up with the last 6 months of Dexter time and set the stage for the season. The first episode of nearly every season has been that way (last season being the big exception).
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I have a strong suspension when Harry first found out about Dexter he went to this Dr. to learn how to help him. Is it possible the code was actually designed by her?