Deathworld was Harry Harrison's first novel. It features Jason dinAlt, a gambler whose psychic talents allow him to influence the outcome of certain games of chance.

The book was followed by two sequels, and a "final" short story, "The Mothballed Spaceship".

More recently, a second series was published in Russia (in the Russian language). The first three books in this series were co-written with Ant Skalandis, the fourth was co-written with Mikhail Ahmanov. A fifth book is forthcoming.