Episode three of new ITV drama Trigger Point returned to televisions across the UK last night and viewers think they already have the show solved.
The high-stakes police drama follows Metropolitan Police explosives officer Lana Washington, played by Vicky McClure, as she and her squad go up against a terrorist group named 'The Crusaders' in London.
However, the episode was enough to turn viewers against an unsuspecting character, leaving Lana to deal with a whole host of drama if correct.
Read more: ITV Dancing on Ice viewers are saying the same thing about Stephen Mulhern
Viewers took to social media to 'solve' the mystery twist they thought is coming, and it involves Lana's little brother Billy.
One social media wrote "I think Billy has something to do with this! #TriggerPoint"
Another was far more certain on Billy's role, she wrote "Billy is involved in that terror group #TriggerPoint"
Others agreed, with one user saying he seems "sus" and another calling the sibling "definitely dodgy".
Billy wasn't the only "insider" identified however, with Karl also taking some heat.
One user tweeted: "I believe billy is involved and I don’t trust Karl, he’s a ex army engineer and was jealous of nutkins #TriggerPoint."
What do you think about their theory? Let us know in the comments.
To get the latest showbiz news from WalesOnline sent straight to your inbox sign up for our What's On newsletter here.