May 1940. While the world balances on the brink of war, the paths of Elza, a young actress taking her first steps in the radio drama studios, and Berre, a novice sound engineer with an almost magical hearing, cross in the iconic Flagey building in Brussels — from where the national radio broadcasts. He seeks stability in the intangible power of sound, she in the enchantment of radio plays. Their meeting ignites a spark of love that lifts them above the threat of their time.