Deathworld

Jason dinAlt is a professional gambler whose unreliable psionic talent lets him influence the odds. On Cassylia, Kerk Pyrrus challenges him to multiply a large stake at a government casino. Jason succeeds, survives an attempt to recover the winnings, and accepts Kerk's invitation to visit the planet Pyrrus despite warnings that it is the deadliest human colony.

Pyrrus combines crushing gravity, violent weather, earthquakes, volcanic activity, extreme tides, and high radiation. Its plants, animals, and microorganisms are all capable of killing humans, and they adapt so quickly that returning settlers require fresh survival training. The colonists maintain only one settlement and organize life around an apparently endless war against the environment.

Harry Harrison's Deathworld begins as a gambling adventure and expands into a question about adaptation. Jason enters a society whose discipline is built on permanent emergency, but his outsider's perspective allows him to ask whether the conflict has been understood correctly. Readers can watch how skills used at the casino—attention, risk calculation, and sensitivity to hidden influence—change meaning when the stakes become collective survival.