The Bookseller Mark Pryor

In the first Hugo Marston mystery, Hugo sees his friend Max, one of the bouqinistas who have book stalls along the Siene river, kidnapped at gunpoint, He calls the police but they interviewed someone who said he went willingly with his captor so Hugo gets his CIA agent friend Tom Green to help. But Max is not the only bookseller to disappear, and Hugo's friend Claudia suggested it may have something to do with drugs. Then Hugo becomes a target...