A seemingly mystical murder takes Captain Sophie Maliquot back to the Mont-Saint-Michel region where she spent part of her childhood and where her father, who died years earlier, is buried.

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.

During an afternoon at the swimming pool, a young girl will live her first flirtation. An unexpected sharing of senses that will forever remain etched on her lips.