Death World is a really entertaining read. Jason dinAlt is the hero, a gambler with psionic abilities who is hired by the ambassador of planet Pyrrus (hint, hint) to engineer a gambling coup. He ends up visiting Pyrrus, the most deadly planet ever colonised by humans. All plant and animal life is predatory, and the colonists are locked in a ceaseless battle with them. The colonists, despite their incredible toughness and discipline are slowly losing the battle. Jason sets out to understand this mysterious phenomenon and save the colony. It was a clever story and I really enjoyed it.