Torture, sexual abuse, cruelty - children and adults are in danger all over the world, often because no-one is prepared to speak on their behalf. Occasional voices do cry out - and, for quarter of a century, one of the strongest has been that of Danny Smith. In 1981, he set out to free seven people, trapped in Cold War Moscow, but he didn't stop there. From the sleazy streets of the Philippines, via the jungles of Burma and the dying rooms of China,...