A diverse group of Spanish tourists on a planned trip comes together during a week-long vacation in Lisbon, where they encounter a once-grand hotel now turned to ruins and a handful of dark secrets. When one of the travelers is found dead the day after their arrival, the other four begin to investigate who the killer might be, even questioning whether it could be one of their own group. This team, passionate about true crime and mystery novels, will have to confront the police, the names on their suspect list, the threat of being expelled from the trip, and their own hidden truths before they can leave Lisbon.