Voyager In Night by C. J. Cherryh

In this science fiction novel, a small crew aboard a space vessel encounters a mysterious and ancient alien ship, leading to a series of harrowing events. The crew members find themselves in a perilous situation as they are subjected to the alien ship's enigmatic and potentially malevolent intelligence. As they struggle to understand and survive the alien technology, themes of identity, consciousness, and the nature of existence are explored. The narrative delves into the psychological and existential challenges faced by the characters as they confront the unknown and grapple with their own humanity.