The Waste Land, which certainly is 'An Entertainment', cleverly combines two plots.
It is terrific read, and clearly very well researched. The main plot provides a fun way to brush up on your crusade history. The characters, based mainly on real people (very helpful list at the front) come to life and engage you. The author's descriptive prose is hugely effective - I felt positively claustrophobic during our hero's efforts to escape his rock prison, the battle scenes were very evocative, and as for the raunchier bits ... enough said.
Although the junior plot by length, the St Lazarus College story is just as skillful. It is a brilliant and mordant sketch of the senior common room. The author bounces the different characters and their self-interests off each other, presenting a witty view on the mechanics of plot development whilst staying absolutely true to the historical facts.
This will make a very good movie. Nearer term, I can't wait for the sequel, to learn of our hero's fate and also more of the mysterious, 'disfigured' Research Assistant at the centre of it all.