Star Wars: Splinter of the Mind’s Eye
by Alan Dean Foster (Del Rey, 1978)
Set and first published between A New Hope and The Empire Strikes Back, Foster’s hurriedly written, workmanlike tie-in novel sends Luke and Leia on a meandering, curiously pointless quest, before pitting them (belatedly) against an ineffectual and always-likely-to-be canonically suspect Darth Vader.