Splinter of the Mind's Eye

Published in 1978, this novel is a sequel to the original Star Wars film.

It follows Luke Skywalker and Princess Leia as they crash-land on the swampy planet of Mimban.

They must navigate the local inhabitants, avoid Imperial forces, and search for the powerful Kaiburr crystal.

Along the way, they encounter various dangers, including Darth Vader, and engage in a series of battles to survive and escape the planet.