The third last book in the Grand Tour series is Venus (atleast for now). This is the story about Van Humphries, Martin Humphries son, and his trip to Venus, where he should recover this older brothers remains.
The surface of Venus is the most hellish place in the solar system. The ground is hot enough to melt aluminum. The air pressure is so high it has crushed spacecraft landers as though they were tin cans. The sky is perpetually covered with clouds of sulfuric acid. The atmosphere is a choking mixture of carbon dioxide and poisonous gases.