Used book – Le Mystère de la rose bleue, CE2 - CM1. Book, Pierre Debor

David picks up a rose wrapper that has fallen from a car. Blue roses. Yellow, red or blue, what does it matter? Mistake! Blue roses don't exist. And David, being a horticulturist's son, knows this. Yet, he's not dreaming. He holds the precious flowers away from prying eyes, with the firm intention of solving this mystery. Aided by an unexpected and unpredictable friend and a clever cousin, nothing will stop him!