The Back of Beyond

Mark Thomas is a sailor on a freighter ferrying people and lithium ore between the utopian colony world, Elysium, and Earth. The starship is sabotaged, the crew presumed lost. But there's one survivor. Alone, Mark finds safe harbor in the barely charted star system, Trappist-1. Marooned, he thought that his biggest challenge was how to call for help. When he discovers that something ancient and dangerous is also marooned in the archipelago of a star system, his plight goes from bad to worse.