Subsequently, he returned to the Netherlands once again and joined Willy Rosen's "Theater der Prominenten" (Theatre of Celebrities), until in 1943 –like so many of his colleagues– Ehrlich was imprisoned in the Westerbork concentration camp.

A majority of the actors were famous Jewish show business personalities; prominent artists from Berlin and Vienna, such as Willy Rosen, Erich Ziegler, Camilla Spira, and Kurt Gerron; or well known Dutch performers, like Esther Philipse, Jetty Cantor, and Johnny & Jones.

At its high point, the group counted fifty-one members, including a full team of musicians, dancers, choreographers, artists, tailors, and make-up, lighting, and other technicians, as well as stage hands.

Most of the shows combined elements of revue and cabaret –songs and sketches– but, on one occasion, the program included a revue-operetta, Ludmilla, or Corpses Everywhere—a production whose theme sadly was a premonition of the actors' and other prisoners' fate.

To do so would have violated the most fundamental condition for the troupe's and its members' survival, as life in Westerbork was dominated by the persistent threat of deportation on the next transport to an unknown but deeply feared fate in the East.

Doubtlessly, this artistic activity provided the means for everyone concerned, audiences and actors alike, to retain a small measure of humanity, free their minds –if only momentarily– from the tragedy of daily life and nourish the illusion of survival.