"Card Sharks" is a science fiction novel written by George R.R. Martin and released in 1982. The novel is set in a distant future, where humanity has colonized the stars and has developed new technologies such as anti-gravity and faster-than-light travel.

The story follows the adventures of a group of space traders, who are traveling to a distant planet to trade in exotic alien goods. The protagonist of the story is Tom Reamy, a gambler and card shark who is part of the space crew. Along the way, they encounter various dangers and obstacles, including space pirates and a deadly alien race.

The novel explores themes of adventure, greed, and morality, as the characters struggle to navigate the dangers of space and make a profit. The book also delves into the psychology of gambling and the allure of risk-taking, as Tom Reamy must confront his own addiction to gambling and the consequences of his actions.

Martin's writing style in "Card Sharks" is fast-paced and action-packed, with vivid descriptions of space battles and alien worlds. The characters are well-developed, each with their own unique motivations and personalities. The dialogue is sharp and engaging, capturing the tension and humor of the space traders' interactions.

Overall, "Card Sharks" is a thrilling science fiction adventure that showcases Martin's talent for world-building and storytelling. The novel is a fun and entertaining read for fans of space opera and adventure stories. It also offers a unique perspective on the human condition and the dangers of excess and greed in a futuristic setting.