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Global Eye returns for a new series, bringing you forensic journalism from all corners of the world by Â鶹Éç Eye - the World Service's critically acclaimed investigative unit - and featuring expert global correspondents taking you to the heart of the biggest international issues.

This week, Shawn Yuan is in Mexico investigating the extraordinary story of one of the world's most wanted fugitives - a man accused of fuelling the global fentanyl crisis. And from Mexico to Kenya, Â鶹Éç Eye goes inside the online manosphere.