Mentxu and Lourdes Arrieta cannot speak. They cannot control their muscles. Two sisters born with a congenital disorder, labeled "ill" or "lost" even by those who loved them, with no way to communicate, created a unique language for themselves.
| Writing | Jorge Gil Munarriz | Screenplay |
| Directing | Jorge Gil Munarriz | Director |
| Production | Aitor Arregi | Producer |
| Sound | Pascal Gaigne | Music |
| Directing | Jose Mari Goenaga | Assistant Director |
| Crew | Javier Agirre Erauso | Cinematography |
| Production | Jon Garaño | Executive Producer |
| Editing | Ibon Olaskoaga | Editor |