To sum it up in one sentence: A forgettable movie, but a forgivable mistake.
Losey. Burton. Delon. Schneider. Cortese. Trotsky. A bunch of great names, thrown into the depths of a weak script that wants to be both, a history lesson and an entertaining political thriller. Shot on location in Mexico and Rome, this European co-production was groomed for international success and turned out to be a devastating disappointment for everyone involved. The audience couldn't cope with it and stayed away, the critics weren't impressed.
The film chronicles the last days of Trotzky (Richard Burton) as a political refugee in Mexico City. Alain Delon tries to play Frank Jacson, a Belgian traveling on a Canadian passport, who murders the dedicated Marxist and atheist.
It is only for a few precious moments that you can partially perceive Losey's talent which he has proved elsewhere (i.e. in "The Servant", "A Doll's House" or "Accident"), and Delon's performance is vain and unconvincing. (The English language clearly overdrew the actor's abilities.) The Losey/Delon team did much better a couple of years later with "Monsieur Klein".