The Eyre Affair by Jasper Fforde

Wow! I hardly know where to begin. The Eyre Affair is funny, intelligent, and above all, clever. The time is modern day England, but Fforde has created an alternative universe where the Crimean War is still being fought, international travel is through a "gravatube" through the center of the earth, and government special forces rule with an iron hand. The protagonist, Thursday Next, is a Special Ops literary detective, solving crimes such as book forgery, theft, and entering a book to change the plot. (Not only is time travel possible here, but people can enter books and alter the story). Through a series of events, Thursday is hunting the most evil man in her world, Hades Archeron. Her chase takes her into Jane Eyre with results that have a very strong impact on the ending. The book is full of so many puns and literary references that it can keep your head spinning. This is the first of a series of Thursday Next novels and a great introduction into Fforde's amazing creativity.