Valerian and Laureline: The Empire of a Thousand Planets (Valerian and Laureline #2)

Valerian and Laureline are exploring Syrte, capital planet of a system of 1,000 worlds. Their mission is to discover whether the Syrtians could present a danger to Earth. What they find is a decaying empire led by decadent aristocrats, a population ripe for revolution, and a mysterious caste of masked wise men who discreetly pull the strings from hidden fortresses. Swept up by the winds of history, the agents of Earth will have to choose a side.