On the edge of the ring road, at the top of a concrete tower block, Mapi listens every night to the voice messages sent to her by Gabi, her boyfriend whom she has mysteriously stopped answering. With summer approaching, the floor is gradually emptying, and the few remaining tenants would like to understand their friend's silence. But within the walls of the Hôtel Minéral, it seems difficult for anyone to re-establish communication.