"Galaxity, capital of the Terran Empire in the 28th century. Valerian and Laureline are agents who protect mankind from rogue time travellers. Now they are sent to New York in 1986 to intercept Galaxity's worst megalomaniac, Xombul-- except that in 1986, the world is in ruins and New York is about to be swallowed by the ocean. The two agents must navigate the shifting waters of the past to make sure that the future will exist"--Page 4 of cover

Agents Valerian and Laureline discover that a group of newly-colonized planets are threatened by a mysterious runaway planet, which turns out to be hollow and inhabited by two warring city-states, each ruled by a different gender.

Our two spatio-temporal agents are on a new mission, but this time the duo is split up. While Laureline flies solo from planet to planet, on the trail of arms dealers and forbidden technologies, Valerian is on 20th century Earth, teamed up with the eccentric Mr Albert. And he, too, is hunting down technologies incompatible with the era. What is the link between the two cases, separated as they are by centuries and light-years?

Marissa had thought her bonded mate, Theo, was dead. His sudden return after almost eleven years throws her life into chaos. Theo's memories of the missing years spark a search into his past, revealing a hidden legacy, a priceless treasure, and a woman determined to rule the world. Will Marissa and Theo have time to rebuild their relationship and their family with their precocious ten-year-old twins? Or will the greed of one woman destroy everything...