Another day in Barcelona, another slimy politician's wife is suspected of infidelity. Lluis Font discovers a portrait of his wife in an exhibition that leads him to conclude he is being cuckolded by the artist. Concerned only about the potential political fallout, he hires twins Eduard and Pep, private detectives with a supposed knack for helping the wealthy with their "dirty laundry." Their office is adorned with false doors leading to nonexistent private rooms, a mysterious secretary who is always away, and a broken laptop computer picked up on the street. The case turns ugly when Font's wife is found poisoned by a marron glac from a box of sweets delivered anonymously.