A short, fascinating book about a topic that you wouldn't think all that interesting - longitude. The book looks at the historical challenge for sailors not being able to figure out what their longitude was while at sea, and the contest for scientists (or clockmakers as it turns out) to come up with an accurate method to determine longitude at sea.
I really enjoyed this read. I liked the debate between those who wanted to use the stars and those who wanted to develop an accurate clock that could keep perfect time at sea. I won't say more so I don't give away the story, but worth a read for anyone interested in the 18th century, the age of sail, or just a good story.