For several months, Anna and Xavi have been living with Tahiya, a young woman of Arab origin whom Anna managed to bring secretly to their apartment in Barcelona. The girl's situation is completely irregular. Trying to help her, Anna first comes up against the secrecy of the system and then her own ethics and morals. In addition, her relationship with Xavi is being affected by all this. When a terrorist attack strikes the heart of the city, fears, doubts, and suspicions surface in all three of them.