Watch full movie online. Sanpietro, the reclusive concierge of an apartment building, has the keys to every unit. At night, he watches the lives of the residents from his dim, solitary studio; by day, he slips into their apartments, immersing himself in their routines and habits. But a chance encounter with the young son of a newly arrived tenant stirs something within him, driving Sanpietro toward a drastic act in his desperate attempt to ease his loneliness.