Police procedural: some detail pertaining to a murder case is nagging at the back of a detective's mind "like having a stone in his shoe." Once he teases it to the surface, he solves the case.
| Directing | Rafael Baledón | Director |
| Writing | Rafael Baledón | Writer |
| Writing | Ramón Obón | Writer |
| Production | Antonio del Castillo | Producer |
| Sound | Sergio Guerrero | Music |
| Editing | Juan José Marino | Editor |