"The Boys from Brazil" is admittedly an improbable movie, but chilling nonetheless. American college student Barry Kohler (Steve Guttenberg) finds Nazi doctor Josef Mengele (Gregory Peck) hiding out in South America. Kohler tries to report Mengele's diabolical plans (for a Fourth Reich) to Nazi hunter Ezra Liebermann (Laurence Olivier*), but Mengele murders him. The rest of the movie shows Liebermann investigating the mysterious deaths of several men around the world, all of whom had sons who look exactly the same. The climax comes when Liebermann and Mengele finally meet.
As is apparently always the case with Ira Levin's stories ("Rosemary's Baby" and "The Stepford Wives"), everything seems to be normal at first, until some point where you realize that there is clearly something unseemly going on. It may be an outlandish concept, but the whole movie is quite intense once you realize what Mengele and his cronies are planning.
*Interestingly, Laurence Olivier had played a Nazi in "Marathon Man" two years earlier.
As is apparently always the case with Ira Levin's stories ("Rosemary's Baby" and "The Stepford Wives"), everything seems to be normal at first, until some point where you realize that there is clearly something unseemly going on. It may be an outlandish concept, but the whole movie is quite intense once you realize what Mengele and his cronies are planning.
*Interestingly, Laurence Olivier had played a Nazi in "Marathon Man" two years earlier.