The Eye of Apollo - short story from The Innocence of Father Brown.
That singular smoky sparkle, at once a confusion and a transparency, which is the strange secret of the Thames, was changing more and more from its grey to its glittering extreme as the sun climbed to the zenith over Westminster, and two men crossed Westminster Bridge. One man was very tall and the other very short; they might even have been fantastically compared to the arrogant clock-tower of Parliament and the humbler humped shoulders of the Abbey, for the short man was in clerical dress.
