It doesn't appear as a standalone work, but is included with several collections. The story is a prequel to the events in The Hitchhiker's Guide To The Galaxy and has the young Zaphod Beeblebrox working as a salvage ship operator. He guides some bureaucrats to a crashed spaceship which may be leaking some hazardous materials. The bureaucrats are determined to "make it safe". The comic asides in the story include some of the time travel paradoxes which are a common running theme in Adams' SF work, and plenty of material about lobsters

    Never trust anyone.2. Remember they are always searching.3. Don’t get involved.4. Keep your head down.5. Don’t fall in love.Five simple rules. Ariane Tucker has followed them since the night she escaped from the genetics lab where she was created, the result of combining human and extraterrestrial DNA. Ariane’s survival—and that of her adoptive father—depends on her ability to blend in among the full-blooded humans in a small Wisconsin town, to hide in plain sight at her high school from those who seek to recover their lost (and expensive) “project.”But when a cruel prank at school goes awry, it puts her in the path of Zane Bradshaw, the police chief’s son and someone who sees too much. Someone who really sees her. After years of trying to be invisible, Ariane finds the attention frightening—and utterly intoxicating. Suddenly, nothing is simple anymore, especially not the rules…

    You’ve met Naji. Now go back in time and see Naji in his earlier years, as he seeks a target and ends up clashing with Leila, the river witch.

    Here, at last, is that long lost short story, which appears chronologically between the books Reunion and Darkest Hour. Enjoy!

    Truth-seekers venture from all over the world to his small California hometown, desperate to know the truth about spouses and business partners, willing to pay the highest price for his gift. But the same whispers that made Michael an underground celebrity reach someone who has been hunting for him. What should have been just another work night sends Michael running for his life from a madman assassin—a killer who isn't human—and a global secret society who wants him dead.