In the spring of 2014, an American rap star unwittingly triggered an online hurricane with the ease of a tweet. Hitting an unprecedented nerve on Twitter, accompanied with the hashtag #BringBackOurGirls, the message called fort he release of 276 Nigerian schoolgirls who'd been kidnapped by a little known Islamic terrorist sect called Boko Haram.

A CIA officer and his recruit arrive in Damascus to hunt for a killer

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