A diverse group of tourists on an organized trip to Lisbon find themselves investigating a murder after one of them is killed on the first morning.
MONDAY. The bus hasn't even started moving, and we can already sense that something is off. From the moment they arrive in Lisbon, things begin to go wrong, and they end up in a rundown, crumbling hotel. The next morning, on TUESDAY, they find Fernando lying dead in his room, a missing music box, and a long investigation begins.
WEDNESDAY. The police tags the case a natural death. Daniel, obsessed with the clues that keep emerging, pushes Inspector Gonçalo and the police to their limits. Alicia follows Fabio, but at the center of it all is the deceased Fernando and along the way come a strange explosion, a thief attempting to steal the music box, a new death, make the trip a complete nightmare.
THURSDAY. Our four investigators are one step ahead of the police, and as they piece together Fernando's story, they begin to draw connections between key historical moments in Lisbon and everything happening around them. The city's history seems to speak to them and the puzzle starts falling into place. The existence of an ancient treasure appears to be the key.
FRIDAY. Our four investigators uncover new clues all pointing to a suspect: Nicolau. Pura and Alicia follow him closely. Daniel, the cleverest of the group, continues investigating the treasure. He deciphers that the Cross of Portugal is a key element, but incredibly, Nicolau gets ahead of him. Another crime, the police once again at the Hotel Marqués, and all the tourists become suspects again.
SATURDAY. The trip has already turned tragic, three people dead, several suspects, and the Portuguese police stationed at the Hotel Marqués in search of answers. Just when tempers begin to settle, Daniel and Pilar come face to face with danger, and in this atmosphere, chaos takes over the group. Everyone's a suspect in everyone else's eyes. Daniel risks everything to solve the mystery.
SUNDAY. Daniel is still missing, and everyone is going around the city looking for him. But Alicia, Pura and Fabio must confront their secrets and their past; some of which will even find their way to Lisbon. Confusion and fear intensify when Inspector Gonçalo announces who he believes is responsible for Nicolau's murder. Pura, fluent in Portuguese, discovers the key to everything.
MONDAY. The trip comes to an end, and our investigators unveil their case in grand fashion, on a theater stage. Daniel returns and becomes the star. The pasts of Fernando, Inspector Gonçalo, the Marquis of Pombal, and the treasure of the music box trigger a new earthquake reminiscent of 1755. The rest of Lisbon is fine, but the theater trembles as our investigators finally reveal the mystery.
