Book of October is a short, fun novel about political thought. Sounds unlikely?
A History of Capitalism on the Jubilee Line by John o' Farrell has a group of people stranded on an underground train. The line will flood, but which way should they escape, down a tunnel built by public funding or one from private initiative?
It's very amusing and has a cast of famous political characters from times past.
The book is part of a series themed around various lines on the London Underground.