What is the fine-grained topic of the following text: Luc Besson's latest space opera, Valerian and the City of a Thousand Planets, puts us in the 28th century, with special operatives Valerian (Dane DeHaan) and Laureline work together to maintain order throughout the human territories. Only return the topic.
Luc Besson's space opera "Valerian and the City of a Thousand Planets".