OSO is a journey through the history of a pop icon told by its own protagonists, the Tous family, Spain's most famous jewelers.

It is the morning after Valentine's Day. Sole is arrested in her house, accused of alleged sexual abuse towards Teodoro, her teddy bear. Graciela, her assistant and friend, is the one who reported her. Detectives Justi and Roque have to find out what happened at Sole's house the previous night and which one of them is the true culprit, because Graciela also becomes a suspect in the crime. But the investigation becomes increasingly complex, with the back-and-forth of each of the accused.