Author Ridley Pearson has quite a twisted plot for his latest release, Choke Point. Investigators John Knox and Grace Chu have been hired to locate and shut down an underground sweat shop that uses young girls as slave labor. Knox and Chu know it won't be easy; they expect push-back from the sweatshop owners and maybe even some of its customers. But they don't expect the girls' families to interfere with the investigation. Amsterdam makes a smart setting for the story, with Knox and Chu traveling the historic city's backstreets as they search for a way to free the girls.