Flanked by their two children, Simon and Adélaïde decide, like many Parisians today, to leave their two-room apartment for a quieter and more comfortable life in the country. They are seduced by a house in the middle of nature: space, a vegetable garden, a wood adjoining their garden and above all villagers who welcome them with open arms. A dream come true! But the young couple was soon to be disillusioned: the wood was actually a hunting ground for big game! Although the hunters are friendly, they are not willing to give up their territory, making Simon and Adélaïde's dream of the countryside a living hell. But true to their reputation, our Parisians are not going to let them do it.
Since his wife's death, Andrew Blake is depressed. In an ultimate impetus, he leaves London to go back to France, in the house he met her. This journey through happy days memories won't go as planned.
In the 28th century, Valerian and Laureline are special operatives charged with keeping order throughout the human territories. On assignment from the Minister of Defense, the two undertake a mission to Alpha, an ever-expanding metropolis where species from across the universe have converged over centuries to share knowledge, intelligence, and cultures. At the center of Alpha is a mysterious dark force which threatens the peaceful existence of the City of a Thousand Planets, and Valerian and Laureline must race to identify the menace and safeguard not just Alpha, but the future of the universe.