In a parallel universe, Tricia McMillan is abducted by the Grebulonian researchers to the planet Rupert. The Grebulonians have all lost their memory and no longer know why they left for the Earth's solar system. To create a horoscope that is also valid for Rupert, they send the intergalactic reporter Trillian. Together with Arthur Dent and Ford Prefect, they buzz all over the universe, Arthur becoming a father without his help, Ford buying a pink spaceship from Elvis Presley and Trillian building a solar system for the Grebulonians. The fifth volume of the intergalactic cult series "Hitchhiking through the Galaxy".