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I have enjoyed adding several French editions to my own little collection. I’ve had some luck on Amazon with more recent titles:

• Restart is available under two titles: Ennemi numéro 1 and Repartir
• The first two books of the Hypnotists series are available: Les Hypnotiseurs and Jeux de Mémoire

Another good resource is Alibris, which lists used books from many resellers. There, I’ve found (in addition to the ones Mr. Korman mentioned):

• The “Island” series (“Naufragés” 1-La Tempête; 2-La Survie; 3-L’évasion)
• The “Everest” series (“Everest” 1-Le Défi; 2-L’escalade; 3-Le sommet)
• The “Dive” series (interestingly, this series was printed under two imprints: First is “Plongées” 1-L’épave; 2-L’émeraude; 3-Le Trésor; and the second is “Sous la mer” 1-L’épave; 2-Les profondeurs; 3-Le péril)
• The “Griffin Bing/Swindle” series (L’éscroc is Swindle; L’évasion is Zoobreak; Piégé is Framed)
• The “Bruno and Boots/MacDonald Hall” series (“Collège MacDonald” – Bruno et Boots mènent le bal and Deux farceurs au collège are two imprints of This Can’t Be Happening at MacDonald Hall ; Méfiez-vous du Poisson! and Bruno et Max font des vagues are both imprints of Beware the Fish)
• The “Titanic” series (“Titanic” 1-Insubmersible; 2-La Collision ; 3-S.O.S.)