nobody knows anything
¡Todos lo saben todo y nadie sabe nada!
Everyone knows everything, and no one knows anything!
Hace dos años que nadie sabe nada de él.
No one has heard from him for two years.
— Jojo Rabbit (2019)
Siempre es así : nadie vio nada, nadie sabe nada.
It's always like this: nobody saw anything, nobody knows anything.
Nobody knows anything about the plan.