Deathworld by Harry Harrison

This Halcyon Classics ebook is DEATHWORLD by eminent science fiction writer Harry Harrison. In DEATHWORLD, professional gambler Jason DinAlt accepts an invitation to visit Pyrrus, the most lethal world in the known galaxy. For outsiders, Pyrrus usually means a quick and painful death, but DinAlt is fleeing the crooked casino masters of Cassylia - where he just broke the bank. But DinAlt is not prepared for the hellish Pyrrus, where every living thing seems bent on exterminating mankind.