This is a Bob Morane novel edited from 1980, called Les masques de soie. Really popular at this time, the Bob Morane serie is an interesting item to expose one a bookshelf.
Bob Morane is a French-language adventure book series, starring an eponymous protagonist, created by the Belgian novelist Henri Vernes. Over 200 novels have been written since its introduction in 1953, making it a quite famous character among the French speaking countries.
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