The Well of Lost Plots by Jasper Fforde

This is book 3 in a series, and it is just as witty as the first two. It helps to have an appreciation of the English language and/or literature. The story is quite unusual - set in an alternate England in the 1980's where the prevailing culture is based on literature. Thursday was a Special Operative in literary detection. In this volume, she takes refuge in an unpublished book by the name of Caversham Heights in the Well of Lost Plots. She must battle with Aornis Hades, little sister of the master criminal Acheron Hades, whom Thursday vanquished in The Eyre Affair. Aornis is a mnemonomorph, meaning that she has been changing Thursday's memories. I rate this book 4 out of 5.