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Keith Thomson blogs about national security matters for the Huffington Post. In addition to his journalistic duties, he\'s also a screenwriter and has written several novels. He\'s appeared on book talk to discuss Once a Spy and Twice a Spy about a retired CIA agent with Alzheimer\'s, but today we about his new one, Seven Grams of Lead, where a journalist learns too much and goes on the run to discover the truth and save his own life.