During the interlude Epstein was spirited away and a dead body double substituted - the real Epstein is too valuable to kill and too valuable to leave alive. Wherever he is he will never be seen again. The truth will never surface.
You should watch Dark Passage 1947. Humphrey Bogart and Lauren Bacall. Bogart breaks out of San Quentin and Bacall helps him escape after his plastic surgery.
The scenes with the plastic surgeon are great as well as the cinematography.
https://en.m.wikipedia.org/wiki/Dark_Passage_(film)