Shahram Amiri sounds like a contented man in one video, nestled in a leather chair, assuring his audience that he is free and safe to continue his education in America.

But in a second clip the Iranian scientist warns in stilted phrases that the CIA kidnapped him, brought him to the United States and tortured him with the goal of "proving lies" about Iran's disputed nuclear program.

The two online videos sum up the murky and contradictory narratives at the heart of Amiri's tale, which took a surprising turn late Monday when the 32-year-old scientist presented himself at the Iranian consular office in Washington, D.C., saying he wished to go home.

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