The Man Who Knew Too Much (1934)

This is Hitchcock's first time making this, not the Fifties' remake with Jimmy Stewart. Leslie Banks and Edna Best are on a family vacation in Switzerland when their friend is killed. Before he very calmly dies of a gunshot to the chest, he passes them a message they need to deliver to the British consulate. 

Complicating matters is that someone has abducted their extremely irritating daughter, so they can't pass on the message, and a foreign diplomat may be killed. Some guy from the Home Office tries to shame them with warnings of guilt if this causes a war, but imagine the guilt if they get their daughter killed.

The Home Office guy does trace a threatening call the family receives, which is enough for the husband and his brother (who is the comic relief as all sorts of bad luck befalls him) to go snoop around the area. There's a long stretch where Banks is a prisoner and Best tries to find the assassin at a concert. The concert part is at least somewhat tense, since it isn't clear whether Best has any chance of spotting the killer, or if she can do anything if she does. Banks as a prisoner, is not so tense, because everyone's just sitting around, waiting to hear what happened. The movie ends with a lengthy armed standoff, which is mostly shots of people ducking at the sound of gunshots or glass breaking. It's not great, but it's not bad. 

There's a few interesting shots in the film, Hitchcock trying to stretch himself, maybe. When they get the note their daughter's been kidnapped, Best staggers away and he switches to this blurred, spinning view for a second or two before cutting back to her fainting. In the concert, Best spies a curtain moving and then the camera shifts to a close-up of the gun barrel slowing emerging. A first-person shot when the brother is being hypnotized where the woman doing it is shot with a hazy filter, but the coin she makes him focus on still glints brightly.

The other thing of note is this was apparently Peter Lorre's first English language film role. He's among the bad guys - surprising none of you, I'm sure - sporting an off-center skunk-stripe in his hair worthy of a moody anime protagonist. His character seems mostly either bored or mildly amused, but there are a few moments where you see him casually order someone around and there's just a hint of authority in there to hint at something dangerous.