Koffi is possessed. At least that's what his family believes, which is why they call him Zabolo, "sign of the devil." He returns to his birthplace in the Congo for the first time in many years, after having been ostracized there for years. Koffi wants to seek his family's blessing for his marriage to Alice, with whom he lives in Belgium. But the old hostilities are still palpable; only his sister Tshala is critical of the collective superstition. Koffi wants to understand the reasons for his ostracism and, in doing so, uncovers a family secret. And then there's Paco, a boy from a street gang whose fate seems to be intertwined with Koffi's life …