Pax Novis by Erica Cameron 

Cira Antares is deeply loyal to two things: Pax Novis—the cargo ship captained by her mother that transports supplies across war-torn star systems—and her personal mission to save war orphans. But hiding them as stowaways on the ship is illegal, and if any of them were found, not even her mother could protect Cira from the consequences. She has successfully kept her secret. until supplies start to go missing. Food. Clothing. Tools. All signs point to her stowaways, but they wouldn’t do anything to risk exposing themselves… Read more.