Starting with an everyday occurrence, the baking of a cake to welcome home the daughter of the building manager from abroad, hostilities break out between the residents of an apartment block when they find out that one of them is throwing their rubbish from their balcony on to the street below. The process of uncovering the guilty party will lead the neighbours to violent reactions but also to interesting confessions, while the building manager attempts to maintain the balance between the suspects, one of whom is also an immigrant.