 Why does Mr. Oyster want to hire Simon and Betty?
He looked over at Betty and said, almost as though reciting, "What I need is a vacation." "Providence," Simon told her whilst fiddling with the aspirin bottle, "will provide." Simon said unenthusiastically, "Good morning, Mr. Oyster." The client fussed himself with Betty's assistance into the seat, bug-eyed Simon, said finally, "You know my name, that's pretty good. Simon seemed incapable of carrying the ball this morning, so Betty said, "But ... Mr. Oyster, if the future has developed time travel why don't we ever meet such travelers?" "The usual explanation, Betty, is that they can't afford to allow the space-time continuum track to be altered. Mr. Oyster returned his glasses to their perch, bug-eyed Simon, but then nodded. Mr. Oyster was taken aback himself. "A hundred dollars a day plus expenses," Mr. Oyster said quietly. It goes like this:" I got a thousand dollars from Mr. Oyster (Simon began) in the way of an advance, and leaving him with Betty who was making out a receipt, I hustled back to the apartment and packed a bag. It takes roughly seven and a half hours from Gander to Shannon and I spent that time dreaming up material I could put into my reports to Mr. Oyster.
 He thinks the time traveler will have the secret to never-ending youth.
 He thinks the time traveler will have the secret to never-ending youth.  He wants to know the secret of time travel and they are the best investigators around.  He wants to make sure his family's wealth continues in the future.  He wants to find out a secret for political reasons.