Paul Stewart works with the well-known illustrator Chris Riddell.
These are the books by Paul Stewart and Chris Riddell that are reviewed on this site:
Times are difficult in the ancient and learned sky city of Sanctaphrax. But when Maris and Quint join forces to help her father with his important research, they unwittingly unleash the ancient curse of the gloamglozer . . .
Lowly, insignificant under-librarian dreams of becoming great Librarian Knight . . .
Corby Flood solves mysteries, mends broken lives, and is loved by everyone, except the five unamusing clowns in bottle green bowler hats...
Quick-witted tick-tock boy meets wolf on rooftops. Disposes of same. Solves wicked mystery. Unsung hero.
More adventures with Barnaby Grimes as he runs errands across the city, through the alleys and over the rooftops. But there are dark forces to match himself against.