The Fourth Bear by Jasper Fforde

...and Goldilocks ran off into the woods and was never seen again...
Jack Spratt and Mary Mary are called in to investigate to disappearance of Goldilocks and uncover an unlikely conspiracy involving Quang-Tech, SommeWorld, the Gingerbread Man (is he a cake or a biscuit?), Dorian Gray, Virginia Kreeper and extreme cucumbers.

The Big Over Easy by Jasper Fforde

Who murdered Humpty Dumpty?
Jack Spratt and Mary Mary of the NCD (Nursery Crime Division) investigate suspected fowl play in the death of Reading's most ovoid figure, while trying to fend off the encroachment of Friedland Chimes... one of the greatest literary detectives since Sherlock himself...

Something Rotten by Jasper Fforde

Thursday Next has left BookWorld with her son (Friday) and returned to the RealWorld to live with her Mum (Wednesday). Will she be able to ensure that the Swindon Mallets win the Croquet Superhoop, thereby stopping Chancellor Yorrick Kaine, the fictional megalomaniac, from becoming the Dictator of England, put a halt to the gallop of the evil Goliath corporation, avert a war with Denmark and prevent the Earth from turning into a mouldering radioactive cinder a week from next Tuesday? While she's about it, she needs to keep the BookWorld ticking over, find a Shakespere, smuggle Danish books into Wales, avoid a very determined assassin and reactualise her husband. All in a day's work.

The Well of Lost Plots by Jasper Fforde

It's big, it's clever and it makes me laugh. Thursday Next is pregnant with her non-existant husband's child and has taken refuge from the evil little sister of her vanquished arch-nemesis in the Well of Lost Plots. As if that's not enough for her to deal with, she must also avoid being murdered by a renegade JurisFiction agent, while all around her are popping off like flies. Who is behind the dastardly plot that threatens the Well of Lost Plots and the rest of BookWorld? How far does the corruption extend? Read on to find out...