"At the close of the second season, Hetty had mysteriously disappeared, and the team had uncovered her whereabouts. Season 3 begins with a rescue attempt that ultimately reveals information about Callen and his family." -- iTunes Store
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As the team travels to Romania to search for Hetty, Callen discovers new information about his past.
the fine print: Downloads posted on the Free iTunes Downloads blog are usually free for ~1 week. After that, you'll have to pay for them.