Alfred Hitchcock originally made another film of this title in 1934, in Britain, then went back and made a longer, fuller version in 1956, in the middle of his great period in which he made “Rear Window” (1954), “Vertigo” (1958), “North by Northwest” (1959) and “Psycho” (1960).

The story involves a married couple, on vacation in Morocco, who accidentally comes upon information that a major world leader is about to be assassinated. To keep them from going to the police, the conspirators kidnap their child. The task of the couple is to get their child back and, if possible, thwart the assassination. The big innovation of this 1956 version is that the husband and wife, played by James Stewart and Doris Day, have a pretty burnt out marriage. He plays a hard guy, a physician who tricks his wife into allowing him to sedate her, because he doesn’t want her getting all emotional as he works to get back her son.

This is another film that gives the lie to Stewart’s aw-shucks image. He had a major dark side, and Hitchcock was particularly good at bringing it out.

"The Man Who Knew Too Much": 5:20 and 9:50 p.m. Sunday, May 19. $7. Stanford Theatre, 221 University Ave., Palo Alto. 650-324-3700. https://stanfordtheatre.org