Deathworld by Harry Harrison, Science Fiction, Fantasy

Set against the backdrop of a high-stakes casino on Cassylia, the protagonist faces a daring challenge from Kerk Pyrrus, an ambassador from the harsh planet Pyrrus. Tasked with transforming a substantial sum of money through gambling, he navigates the treacherous environment of a government-run casino. The narrative explores themes of risk and ambition, all while highlighting the brutal reputation of Pyrrus, suggesting that it may be the toughest planet in the galaxy.