Line of Duty is due to end with a heart racing finale this weekend.
But there's another mystery that has had viewers scratching their head and that is where they have seen DS Chris Lomax before.
The detective has flown under the radar for the majority of the series but this week fans suspected that he is working for the OCG after he was heard saying he would meet for a drink at the Red Lion pub, which was also linked to murder suspect Terry Boyle.
While his involvement with the OCG might be revealed in the finale, the Mirror has revealed what shows actor Perry Fitzpatrick was in before.
Perry has actually been on our screens for more than two decades, making his TV debut in Peak Practice at the start of the millennium, when he was still a teenager.
Over his time as an actor, Perry has been in some of the biggest shows on TV, from Downton Abbey to Peaky Blinders, as well as playing a copper in comedy Man Like Mobeen.
In 2019, Perry also starred with his Line of Duty co-star Vicky McClure in hit drama I Am.
While this is an impressive CV of roles, it was his portrayal of Flip in the This Is England miniseries that viewers most recognised him from.
It's a world away from his current role as in the series, which also starred Vicky McClure, he was a tracksuited 80s/90s wideboy.
*Line of Duty continues at 9pm on BBC1 on Sunday
