What is the importance of Theresienstadt in the novel, War and Remembrance?

Theresienstadt is the German prison camp where Aaron, Natalie and Louis end up. Described as idyllic and often referred to as a "spa" and "paradise ghetto," Theresienstadt is where the notable Jews and half-Jewish people are sent. The Red Cross confirms the "curious" existence of the village, and there are pictures of Jews—all wearing yellow stars—casually sipping coffee at a café, rehearsing for a play or strolling through a park. It is actually a hoax with horrible conditions, and is a holding place for Jews bound for the death camps.