Alphonse, 70 years old, returns to his native country after 40 years as an expatriate in Spain. This is a journey of redemption, a quest for reconciliation and forgiveness. Alfonse will have to speak up and explain 40 years of silence, and face up to the present and his shame and disillusions. The one-way door is a trip between two worlds, a journey through time, between the here-and-now and the world beyond, a trip back to the starting point. This is a portrait of the conflict between immigration and identity.