What a great first half this movie had. It was novel, sharp, suspenseful, and all-around compelling. Beautiful storytelling and confident filmmaking. And then… the second half began.

I’ve always liked movies with a limited setting. Constraints often force creativity. Try writing a story in which no one can speak. Imagine a story that takes place entirely inside a car. Or one that features only a single character.

Limitations like these instantly spark curiosity and suggest a strong, focused premise.

Heretic takes a similar approach, limiting its setting to a single house with only three characters. And for about an hour, the filmmakers execute this premise wonderfully. I was genuinely on the edge of my seat, eager to discover where it would all lead. Framing a classic captivity-horror scenario within a theological debate was a refreshing idea. It gave the film a unique identity. Well done.

But after that first hour, everything slowly falls apart. The tension weakens, the focus blurs, and we’re left with a lackluster resolution in the final ten minutes. To bring the story to its conclusion, the film even abandons logic and internal consistency, relying on one deus ex machina after another.

Heretic is a great example of a story built on a strong — perhaps even brilliant — idea that works beautifully for half a film, only to lose its way because the ending can’t live up to the premise.

And that dynamic makes Heretic feel like a let down despite it being one of the best movies of the last couple of years.

Having a great idea is winning half the battle. But if you can’t carry that idea through to a satisfying conclusion, your audience will feel betrayed.

Interestingly, the opposite can also be true. The movie Barbarian, which operates in a similar genre, had the reverse effect on me. During its first half, I was close to losing interest. But then the story took a bold and unexpected turn, delivering a much stronger second half. When the credits rolled, I didn’t feel disappointed — I felt rewarded.

The lesson is simple: Once you’ve found a great idea for a story, don’t fully commit to developing it until you’ve found an ending that is just as strong — or even stronger.

Because in storytelling, how you finish often defines how your audience remembers the whole experience.