Most IMDb critics claim that this is unlike any other Cary Grant role, but I think his performance is remarkably reminiscent of "Notorious." Agent Devlin was more romantic, to be sure, but Dr. Ferguson is also a cool, calm, rational, and duty-bound man in a political maelstrom: he's a surgeon, vacationing in a banana republic whose tumor-stricken dictator shanghais him. The result is a trenchant dramatic character, which Grant does very well, supported by Ramon Novarro and Gilbert Roland, who always add quality to a movie. And I'd single out two other performers:
The Spanish composer Vicente Gómez graces only one scene, in a café, but he plays a soulful guitar solo that I wanted much, much more of.
And then there's José Ferrer as the dictator. He almost steals every scene, especially when he watches Grant's amateur surgical team drill into a fake human skull, rehearsing for the surgery awaiting the dictator himself tomorrow. When the rehearsal is done, Ferrer is sweating visibly and fumbling with a cigarette. He makes it easy for you to project yourself into that makeshift O. R. with the student surgical team-- you with a brain tumor and a captive surgeon who makes no effort to hide his antipathy.
But Grant holds his own. "Tell them never to use that instrument on the brain again," he says to his translator. "It might suck a piece right out of the brain." Ferrer hears, of course, and through his sweat he asks, "How did it go?" Grant drops the stitched-up skull in a garbage pail and says, "Oh, it went quite well. But you died."