Confession takes place entirely inside a black box theater during a reading of a new play. Ellie has agreed to help read through the script, which was written by her ex-boyfriend, Miles. The two haven't seen each other in years, and while they're able to joke around almost immediately, it's obvious there is still some unresolved history between them.

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At first, the reading goes the way either of them expected. Ellie reads through the script while Miles explains certain choices and asks for feedback. It doesn't take long, though, for Ellie to start recognizing parts of their own relationship in the story. The more she reads, the more convinced she becomes that Miles has written a play about the two of them. Miles denies it, but Ellie isn't buying it.

What starts as feedback on the script quickly turns into something else. Ellie questions the characters and their decisions. Miles defends them. Before long, they're no longer talking about the people in the play. They're talking about themselves and their relationship.

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The reading becomes harder and harder to stay focused on. Every time they try to get back to the script, they end up talking about something from their past instead. Sometimes they're arguing. Sometimes they're laughing. Sometimes they're bringing up things neither of them expected to talk about that day.

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Partway through the reading, a producer arrives with a large prop door that needs to be incorporated into the rehearsal. The interruption gives everyone a chance to regroup, but once the reading starts again, the conversation picks up right where it left off. With the door now separating them, Ellie and Miles continue talking from opposite sides, creating a physical barrier that reflects how far apart they have grown despite knowing each other so well.

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As the conversation continues, it becomes clear that they remember the relationship very differently. Miles is still trying to understand why things ended. Ellie is more focused on everything that happened before the breakup. Neither of them is completely wrong, but they're looking at the same relationship from two very different perspectives.

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Despite the tension between them, there are still moments where their old connection comes through. They know how to make each other laugh. They know exactly what to say to frustrate each other. Spending time together again reminds them why they cared about each other in the first place, even if it also reminds them why they couldn't make the relationship work.

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Over the course of the reading, Ellie begins to realize that the play is less about what actually happened and more about how Miles remembers it. Writing the script has become his way of holding onto the relationship and trying to make sense of it. The problem is that after years of replaying the same memories, he has started treating his version of the story as the complete one.

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For the first time, Miles begins questioning that perspective. As they talk, he starts to recognize that some of the things he has held onto for years may not be as simple as he once believed.

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By the end of the reading, neither of them gets the perfect closure they might have imagined. Instead, they finally have an honest conversation about their relationship.

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As Ellie prepares to leave, she hands the script back to Miles and tells him he should rewrite the ending. At first he assumes she's talking about the play, but it's clear she means more than that.

Ellie leaves the theater, and Miles is left alone with the script, reconsidering both the ending he wrote and the story he has been telling himself for years.