Alexandra Duncan

"Ava, a teenage girl living aboard the male-dominated, conservative deep space merchant ship Parastrata, faces betrayal, banishment, and death. Taking her fate into her own hands, she flees to the Gyre, a floating continent of garbage and scrap in the Pacific Ocean. How will she build a future on an Earth ravaged by climate change?"--

"Ava's adopted sister Miyole is finally living her dream as a research assistant on her very first space voyage. But when her ship saves a rover that has been viciously attacked by looters and kidnappers, Miyole--along with a rescued rover girl named Cassia--embarks on a mission to rescue Cassia's abducted brother, and that changes the course of Miyole's life forever"--