At eighty-nine minutes, Through a Glass Darkly never has a chance to get tedious, which is part of the problem. Writer-director Bergman has just introduced the characters, just established the ground situation, when he tries a graceful segue into the characters and their relationships being familiar in the second act. They’re not. They’re still being established, which makes the purely expository relationship between Gunnar Björnstrand and Max von Sydow something of a time suck. A beautifully acted, beautifully directed time suck.

Glass takes place over twenty-four hours. Popular but intellectually bereft author Björnstrand has returned home to his family after finalizing the draft of his latest novel. There’s twenty-something daughter Harriet Andersson and seventeen year-old son, Lars Passgård. von Sydow is Andersson’s husband. Presumably von Sydow and Andersson have had to take care of Passgård, as Björnstrand seems a rare presence in Passgård’s life.

Andersson is recently out of a mental hospital. It’s unclear, initially, what’s going on, only it’s incurable (or likely incurable). That discussion is von Sydow and Björnstrand’s first scene together alone. Bergman plays it more for character development than exposition, which is far different from the second half of the film, when he eschews character development for exposition. He doesn’t need much character development second half because it turns out to be action packed.

Before Bergman identifies it as schizophrenia–which is made somehow less terrifying by the tranquil isolated island setting (there’s not running water, electricity maybe)–he’s got the rest of the character setup to get done. So a half hour at least because Andersson gets a scene to herself, experiencing her symptoms.

While the film never looks stagy–quite the opposite–Bergman’s script feels not just stagy, but a little too pragmatic. Like he was adjusting around actors schedules. Andersson and Passgård get paired off for scenes whenever von Sydow is busy with Björnstrand. Otherwise it’s von Sydow and Andersson. Björnstrand gets like a scene and a half alone with his kids, the full scenes coming right at the end for the emphasis. He’s a bad dad, who isn’t a particularly good writer. There’s more exposition later, but never time for Björnstrand to do anything with it as far as character development. It’s filler. It’s that time suck.

Because Bergman’s actually got some big time drama in store for the family and he’s got to pace it right.

The problem with the big time drama is it turns out to be a MacGuffin. All the action in the second and third acts turn out to be MacGuffins, since the point of Glass is Andersson and how Bergman presents her character. The film drags a little in the second act, before it’s clear just how well Bergman’s made Andersson seem reliable. The more unreliable Andersson gets–always precisely essayed, in performance and presentation–the more effective Bergman’s initial pacing becomes.

Bergman makes the boring bits essential.

Until he gets to Björnstrand’s big confession scene to von Sydow; it proves as narratively inert as it does for character development. Because then it’s action time, because Andersson’s not just shattering her reliability, she’s going to stomp it into dust.

And it works, no doubt. Bergman sells it. He’s got a great cast. Andersson, Björnstrand, von Sydow, Passgård until the third act. There’s some phenomenal acting in Glass.

Bergman’s not really interested in the characters, he’s interested in the reveals. It’s all kind of melodramatic, actually. As melodramatic as Bergman can get, actually.

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