Fans are stunned.

Netflix series Adolescence has earned critical acclaim not just for its subject matter, but also for the incredible craft behind each one-take episode.

Following a huge streaming success, Stephen Graham and Jack Thorne’s hard-hitting drama has just revealed a secret behind one of its most appreciated episode.

Chapter three sees psychologist Briony Ariston (The Crown‘s Erin Doherty) having a session with teen Jamie Miller (portrayed by newcomer Owen Cooper) after he’s been charged with the murder of a girl at his school.

Netflix 

The tense episode handles some difficult scenes as Jamie opens up on his feelings of disconnection and even becomes physically threatening towards Briony. For her part, the psychologist manages to keep her professional composure but breaks downs as soon as the session is over.

In an Instagram post, wigmaker Samuel James — who’s also behind the hairstyles of Wicked — shared pictures of the wig he created specifically for Briony in this episode, as well as a snap of Doherty during the fitting.

The copper, shoulder-length do could’ve fooled the most eagle-eyed of viewers, as fans of the series and even some industry pros admitted not having spotted the detail.

Netflix 

“First time ever I didn’t realise someone was wearing a wig on the screen! I can normally tell straight away! Well done,” one person noted.

“Wow. Never would have thought that was a wig!” someone else added, while another person wrote called the look “Stunning”.

“That looks amazing,” was another comment. “People don’t know that it’s the simplest hairstyles that are the hardest to get perfect in a wig… and you guys nailed it… so flat on top… beautiful part and the hair is gorgeous.”

Adolescence is streaming on Netflix.