The Dead Colony (Pelicos Trilogy)

It is the year 2458. The starship Hofstadter returns from its century-long trip to Earth to discover that the colony on Pelicos is in ruins. A devastating civil war decades earlier destroyed all forms of technology, and now the colony is under the rule of a vicious dictator. The crew of the Hofstadter dispatch a team to investigate the situation, but they've underestimated the situation and are quickly overpowered. Meanwhile, a mutiny has broken out on the starship. Now alone on the planet, Conner Hassan and Val Jaques realise that they cannot rescue their team without help from the Hofstadter, and they can't rescue the starship crew without help from their team...