The Lewis Barnavelt series was translated into French beginning in 2001 with La pendule d'Halloween. However, the publisher, Rocher, changed the names of Lewis and Rose Rita to Kévin and Emily - a decision that the illustrator, Lalex, said was to give the books a more American feel to French readers. She illustrated 10 books in the Barnavelt series (through The Whistle, the Grave, and the Ghost). An anthology of the first three Lewis...er, Kévin novels was released in 2001.

In 2004, began illustrating the Johnny Dixon series; the eighth and final book in the series (whose publication order differs slightly from the original American publishing order) was The Drum, the Doll, and the Zombie.