The book is very entertaining, but Christian readers may not like its occasionally amoral tone.
Plot
Arthur Dent is a normal person living in England, when all of a sudden he is pulled off the planet and onto a spaceship by his friend, Ford Prefect. Ford Prefect turns out to be a type of alien, who was sent to earth to write an article for the galactic encyclopedia "The Hitchhiker's Guide to the Galaxy". Unfortunately, the spaceship belongs to the Vogons, a race of evil aliens who were sent to destroy Earth. The Vogons throw Ford and Arthur out of the ship as soon as they are discovered, and Ford and Arthur end up on another ship called "The Heart of Gold", which is the fastest ship in the galaxy.
Aboard this ship are 3 characters: Zaphod Beeblebrox, who is trying to find the mythical planet-makers, Trillian, who is Zaphod's girlfriend, and Marvin, a robot who is pessimistic about everything.
Morality
Morality is a bit sketchy. Zaphod Beeblebrox spends his entire life in politics to become the president of the galaxy, for the sole purpose of stealing The Heart of Gold.
Spiritual Content
Evolution is brought up several times and treated as fact. God is ridiculed more than once.
Violence
Violent things happen, such as the Vogons blowing up planet earth, but there is no explicit violence.
Drug and Alcohol Content
A lot of alcohol is consumed by Arthur and Ford, but they never actually get drunk.
Sexual Content
Arthur has a crush on Trillian, but nothing ever comes of it.
Crude or Profane Language or Content
A few uses of "What the H**l" and "S**t".
Conclusion
"The Hitchhiker's Guide to the Galaxy" is wonderfully well-written, and is sure to have the readers laughing along every page. The whole book is filled with random side-stories and jokes that are very clever. However, in general there is a disrespect toward God, and sometimes the main characters do immoral things for the sake of absurdity.