Vahid Mobasseri plays Vahid, the mechanic who vividly remembers the guard's squeaking prosthetic leg and is shaken when a random customer at his shop makes the same sound. Full disclosure, I watched this on another long haul plane flight and had to re-watch the beginning on land to hear the squeaking. Vahid assembles some friends, including Mariam Afshari, who plays photographer Shiva, who were imprisoned with him, to try to determine if they have the right man. Because the prisoners were blinfolded, they can't be sure. Ebraham Azizi plays the suspected torturer.
Director/writer Jafar Panahi was banned from making movies in Iran, hence the secrecy. No composer and no music credits are at the end. There's plenty of fascinating trivia on imdb.
Mobasseri has been in four other features and Afshari's been in one in their native country. Azizi has about a dozen features and many shorts under his belt. Panahi has directed eleven other features plus some shorts and segments of movies.
Rotten Tomatoes' critics and audiences quite intentionally love this one, averaging 98 and 93%. I rented it for the plane ride on February 27 (see what I wrote at the end of The Secret Agent for instructions for offline rentals). Now, however, you can also stream it on Hulu with a subscription.