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So Long, and Thanks for All the Fish (1984, ISBN 0-345-39183-7) 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.
Arthur Dent has hitch-hiked through the galaxy and is dropped off on a planet in a rainstorm. He realises that he appears to be in England on Earth, even though he saw it destroyed by the Vogons. While he has been gone for several years, it appears only a few months have passed on Earth. He manages to hitch a ride with a man named Russell, who is driving home his sister Fenchurch (Fenny for short). Russell explains that she had become delusional after worldwide mass hysteria over the "hallucinations with the big yellow spaceships" (Vogon Ships). Arthur also learns that all the dolphins disappeared shortly after that event. 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 then uses for his Babel Fish. Arthur considers that Fenchurch is somehow connected to him and to the Earth's destruction, and finds that he still has the ability to fly whenever he lets his thoughts wander. . . . . . .