Warning! This second volume in the "Hitchhiker's Guide to the Galaxy" series is definitely not a standalone book. Enjoying, or even understanding, the continuing adventures of Earthling Arthur Dent, his strange pal Ford Prefect, and the very, very odd Zaphod Beeblebrox requires previous study and preparation. Arthur and Ford, having survived the destruction of Earth by surreptitiously hitching a ride on a Vogon constructor ship, have been kicked off that ship by its commander. Now they find themselves aboard a stolen Improbability Drive ship commanded by Beeblebrox, ex-president of the Imperial Galactic Government and full-time thief.