Conversation so far:
What was the storyline for M. John Harrison's Viriconium series of books?
Viriconium is known as the Pastel City. Both universal and particular, the city has a shifting topography and history, and is sometimes known by names such as 'Uroconium'.

Question: How many books were in the series?
Self-contained rewrite: How many books were in the Viriconium series?