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Fergal Keane talks to Claudia Wallace. Mexico has become one of the kidnap capitals of the world as drug gangs seek to consolidate their power. Claudia's brother Hugo was one of the many hundreds who go missing each year. He was abducted in 2005 and his body has never been found. Believing the police to be involved in his disappearance, Claudia and her mother Isabel decided to investigate the case themselves, sometimes wearing disguises to eavesdrop on those they knew were involved. They discovered Hugo had been lured to an apartment by an attractive woman and killed the night he was taken, his body is disposed of in black bin liners. But extraordinarily they managed to bring 5 of his kidnappers to justice, a rare occurrence in Mexico. And they have pressed for, and achieved, changes in the law on kidnapping.