Ren grew up listening to his mother tell stories about the Star Hosts – a mythical group of people possessed by the power of the stars. The stories were the most exciting part of Ren’s life, and he often dreamed about leaving his backwater planet and finding his place among the neighboring drifts. When Ren is captured by soldiers and taken from his home, his dream slips further out of his grasp. Now a slave of a despotic Baron, Ren must remain inconspicuous while plotting his escape. It’s a challenge since the general of the Baron’s army is convinced Ren is something out of one of his mother’s stories. Ren finds companionship in the occupant of the cell next to his, a drifter named Asher. A member of the Phoenix Corps, Asher is mysterious, charming, and exactly the person Ren needs to anchor him as his sudden technopathic ability threatens to consume him. Ren doesn’t mean to become attached, but after a daring escape, a trek across the planet, and an eventful ride on a merchant ship, Asher is the only thing that reminds Ren of home. Together, they must warn the drifts of the Baron’s plans, master Ren’s growing power, and try to save their friends while navigating the growing attraction between them.

Three months have passed since the events of The Star Host, and Ren is living aboard the Star Stream under the watchful eyes of the Phoenix Corps. Plagued by vivid nightmares that ravage the ship in his sleep, he struggles to prove he isn’t a threat and fears he has traded one captor for another. His relationship with Asher, whose efforts to balance his personal loyalty to Ren with his professional duties to the Corps are failing, fractures. Adrift without an anchor, Ren must return to his home planet of Erden if he has any chance of reversing his dangerous descent into madness. There, he hopes to search for his missing brother and salvage his relationship with Asher. What he finds is knowledge that puts everyone’s allegiance to the test.

When Ren wakes from his life-threatening injury on the Star Stream, he learns that Asher has left with the Phoenix Corps and that the Corps believes Ren to be dead. Despite the opportunity to disappear, Ren is determined to fix his mistakes. He convinces the crew to join him for one last mission—find Asher, free Liam, and escape from the Corps’ reach. But a war is brewing between two formidable armies, and, despite his wish to flee, Ren is drawn into the conflict. With his friends by his side, Ren must make a choice, and it will affect the future of his found family and the cluster forever.