It's one of the scariest stories of international tension in recent memory. When Laura Ling and fellow news producer Euna Lee went to the Chinese/North Korean border to film a documentary about North Korean defectors, their guide took them north, past one of the most tense borders in the world, to visit a safe house in dangerous ground. Warily, the two soon backtracked south and were knocked out by the butts of two North Korean army-issue rifles, only to wake up in custody of the most diplomatically isolated country in the world. That's horrific enough by any standards. But soon, the two roving journalists were ordered to 12 years of hard labor with no appeal or chance of parole in a country where they couldn't speak a word of the language, unsure if they'd live to see the end of their sentence. Laura Ling's sister (and well-known TV journalist), Lisa, soon spearheaded a campaign to free the two, President Clinton hopped on board and the rest is history, soon written into a celebrated memoir written by the Ling sisters, titled "Somewhere Inside: One Sister's Captivity in North Korea and the Other's Fight to Bring Her Home." They're visiting the Clinton Museum to discuss those tense weeks and sign copies of their new book.