Si es martes, es asesinato ( If It's Tuesday, It's Murder: Season 1 )

The bus hasn't moved yet, but something feels wrong. Upon arriving in Lisbon, problems start immediately. Tuesday morning, Fernando is found dead in his room, a music box is missing, and a lengthy investigation ensues.

Police rule it a natural death, but Daniel obsesses over emerging clues, pressuring Inspector Gonçalo. The deceased Fernando remains central as an explosion, a music box theft attempt, and another death turn the trip into a nightmare.

The four investigators stay ahead of police, piecing together Fernando's story while connecting Lisbon's historical moments to current events. The city's history guides them as the puzzle emerges with ancient treasure as the apparent key.

The four investigators find clues pointing to Nicolau. Pura and Alicia tail him while Daniel investigates the treasure, discovering the Cross of Portugal's importance. Nicolau beats him to it. Another crime occurs at Hotel Marqués.

The trip turns deadly with three deaths and suspects. Portuguese police search the Hotel Marqués for answers. As tensions ease, Daniel and Pilar face danger. Chaos erupts, everyone suspects each other. Daniel risks all to solve it.

The trip ends with investigators presenting their case on stage. Daniel returns as the star. Revelations about Fernando, Inspector Gonçalo, the Marquis of Pombal, and the music box treasure trigger an earthquake, shaking only the theater.