Mostly harmless - Adams, Douglas, 1952-2001. (New York : Harmony Books, 1992)
Mostly Harmless is a 1992 novel by Douglas Adams and the fifth book in the Hitchhiker's Guide to the Galaxy series. It is described on the cover of the first editions as "The fifth book in the increasingly inaccurately named Hitchhikers Trilogy
Keywords: Prefect, Ford -- Fiction; Dent, Arthur -- (Fictitious character) -- Fiction; Interplanetary voyages -- Fiction; Fantasy fiction; Science fiction