Adolescence writer Jack Thorne has revealed he won't answer a glaring question from the Netflix series.
Starring Stephen Graham, Ashley Walters, Erin Doherty, and Owen Cooper, the four-part series follows 13-year-old Jamie Miller who is arrested under suspicion of killing his classmate Katie.
Katie was stabbed to death, with the second episode of the show following DI Luke Bascombe and DS Misha Frank visiting Jamie and Katie's school to speak to their fellow students and see if they can recover the murder weapon.
They don't find the knife, but they do find out it belonged to Jamie's friend Ryan and arrest the youngster.
Related: Adolescence viewers in tears after Netflix reveals "horrifying detail" in heartbreaking scene
After the show's explosive ending, many Adolescence fans have questioned whether the knife was ever found as the fourth and final episode took place on the cusp of Jamie's trial.
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But they won't be receiving an answer any time soon as Thorne - who also wrote the This Is England TV series and recent hit Toxic Town - deliberately left some plot threads ambiguous.
"There is a real joy in how partial this show was able to be. It was written in a really partial way, we couldn’t cover all corners," he told Deadline.
"For instance, episode 2 has a whole question going through it, of where is the knife? That’s why DI Luke Bascombe is there.
"We cannot answer that. We don’t answer that. I could have tried to fit it into dialogue in episode three, but that would have felt inauthentic and wrong."
The writer added: "The audience understands the rhythm that we’re in as dramatists. An audience has certain expectations as to what will happen when that has been embedded in the backs of their heads through watching drama as long as we all have.
"What this show can do through the one-shot format is challenge those expectations in a different way."
When asked if he would reveal what became of the knife, he replied: "I’m not going to answer that question, because if I did, then that would spoil it."
Adolescence is available to stream on Netflix now.
