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A final installment in the series that began with "The Hitchhiker's Guide to the Galaxy" is taken from the late author's previously unpublished personal files and features the same offbeat adventures of Arthur Dent, Ford Prefect, and their companions.

Arthur Dent's accidental association with that wholly remarkable book, The Hitchhiker's Guide to the Galaxy, has not been entirely without incident. Arthur has traveled the length, breadth, and depth of known, and unknown, space. He has stumbled forward and backward through time. He has been blown up, reassembled, cruelly imprisoned, horribly released, and colorfully insulted more than is strictly necessary. And of course Arthur Dent has comprehensively...

The Doctor is in Cambridge working alongside companion Romana and retired Time Lord, Professor Chronotis, to defeat the evil alien Skagra who is attempting to steal the secrets to the prison planet, Shada.

Vast dangers lurking in the fantasy realm navigate a path to Earth, becoming a threat in reality, and it's up to Dirk and the gang to stop them in their tracks. But first, they need to find each other.