What's the Name of That Book??? discussion

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The City Under the Skin
SOLVED: Adult Fiction
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SOLVED. Mystery thriller: looking for a trail of tattoos. [s]
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A detail that stood out to me was that to gain trust and get information, the woman got a tattoo of a compass or the NSWE arrows on her feet, since it was one of the most painful places for a tattoo. The north arrow pointed ahead from her toes. That chapter also talked extensively about hand tattoos and how they fade away quickly.
The language and writing style wasn’t very flowery, and it was contemporary writing. I miss it, and I’d love to revisit it.
The cover might have changed, but I seem to remember that the cover had a bright orange.