Just for something to do, two friends, Nuria and Jaime, send an anonymous letter to a person whose name they get out of the telephone directory, and this leads to an adventure. Some days later they are kidnapped by a misterious foreigner, who locks them up in an enormous skyscraper the Suppository. This foreigner is the architect who designed the building; he has taken the anonymous letter very seriously as he feels rather worried about having built the Suppository using very bad materials.
