Deathworld (1960) is a science fiction novel about a gambler, by Harry Harrison. Excerpt from the book: "Some planet in the galaxy must—by definition—be the toughest, meanest, nastiest of all. If Pyrrus wasn't it... it was an awfully good approximation! JASON dinALT sprawled in soft luxury on the couch, a large frosty stein held limply in one hand. His other hand rested casually on a pillow. The gun behind the pillow was within easy reach of his fingers. In his line of work he never took chances. It was all highly suspicious. Jason didn't know a soul on this planet. Yet the card sent by service tube from the hotel desk had read: Kerk Pyrrus would like to see Jason dinAlt. Blunt and to the point."