Grammar question

I can't answer your question, but I'll give you an old ninja trick: when you're unsure about grammar, change the sentence structure to something you're more familiar with.

On a related note, I think your sentence could use improvements on many other levels than actual grammar. "It's dark but not too dark"? Come on. Is it really the kind of stuff you'd expect in your average movie reviews magazine? Formal doesn't mean laboured: make shorter sentences, and make sure they are crystal clear. Avoid repetitions and useless words: saying "the great screenwriting by Christopher Nolan and his brother Jonathan" is more than enough for anyone to figure out it's a collaboration. Not to mention it solves your grammar issue.

Jam it back in, in the dark.