In the summer of 2009, three young Americans went for a hike. Shane Bauer and Sarah Shourd were living together in Syria, teaching and writing. Their friend Josh Fattal was visiting from the U.S. The three took a tour to a waterfall in the Kurdish highlands of Iraq, and as they hiked along a road that turned out to be the border with Iran, an armed man in uniform waved them over.

The next thing they knew, they had embarked on a two-year ordeal in the infamous Evin prison in Tehran. They join NPR's Renee Montagne to talk about their new memoir, A Sliver of Light.

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