Choke Point (Risk Agent 2) by Ridley Pearson
Used mass market paperback (cover may vary).
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Private security firm Rutherford Risk's new client is a philanthropist with a headline-making cause: to locate and shut down an Amsterdam-based sweatshop that uses enslaved girls as forced labor. Enter import/export entrepreneur John Knox, with his former combat experience--and forensic accountant Grace Chu, who can trap and trace even the most sensitive financial information.
Working through the picturesque streets and canals of Amsterdam, Knox and Grace face Middle Eastern mobsters, the owner of a local brothel and police officers they don't trust. Pursuing one young girl who holds the key to their investigation, but is either too afraid or in too deep to help them, they encounter the dark side of a secret world where would-be allies are enemies, and the victims themselves don't want to be saved.