<Tr> <Th> Followed by </Th> <Td> Mostly Harmless </Td> </Tr> <P> So Long, and Thanks for All the Fish is the fourth book of the Hitchhiker's Guide to the Galaxy "trilogy" written by Douglas Adams . Its title is the message left by the dolphins when they departed Planet Earth just before it was demolished to make way for a hyperspace bypass, as described in The Hitchhiker's Guide to the Galaxy . The phrase has since been adopted by some science fiction fans as a humorous way to say "goodbye" and a song of the same name was featured in the 2005 film adaptation of The Hitchhiker's Guide to the Galaxy . </P> <P> While hitchhiking through the galaxy, Arthur Dent is dropped off on a planet in a rainstorm . He appears to be in England on Earth, even though he saw the planet destroyed by the Vogons . He has been gone for several years, but only a few months have passed on Earth . He hitches a lift with a man named Russell and his sister Fenchurch (nicknamed "Fenny"). Russell explains that Fenny became delusional after worldwide mass hysteria, in which everyone hallucinated "big yellow spaceships" (the Vogon destructor ships that "demolished" the Earth). Arthur becomes curious about Fenchurch, but they reach his home before he can ask more questions . Inside his still standing home, Arthur finds a gift - wrapped bowl inscribed with the words "So long and thanks", which he uses for his Babel Fish . Arthur considers that Fenchurch is somehow connected to him and to the Earth's destruction . He still has the ability to fly whenever he lets his thoughts wander . </P> <P> Arthur puts his life in order, and then tries to find out more about Fenchurch . He accidentally finds her hitchhiking and picks her up . He obtains her phone number but loses it . He haphazardly discovers her home when he searches for the cave he had lived in on prehistoric Earth; her flat is built on the same spot . They find more circumstances connecting them . Fenchurch reveals that, moments before her "hallucinations", she had an epiphany about how to make everything right, but then blacked out . She has not been able to recall the substance of the epiphany . Noticing that Fenchurch's feet do not touch the ground, Arthur teaches her how to fly . They have sex in the skies over London . </P>

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