Has Kate Fleming really turned her back on AC-12? (Picture: BBC/World Productions)
**Warning: this article contains spoilers for Line of Duty series six**
Line of Duty returned for the second episode of series six on Sunday night, and the truth about Kate Fleming continues to captivate viewers.
Kate has been one of the biggest talking points of the series so far, having moved away from AC-12 at some point in between series five and six.
The new episodes began with Kate (Vicky McClure) working for MIT having left the old squad behind, and at first an explanation for her move was not given.
She later explained that she felt it was time to move after the events of series five, with the investigation into Ted Hastings changing the dynamic of the team.
There looks to be tension between her and AC-12 too, after episode two saw Kate betray DI Steve Arnott. He he tipped her off about the raid on her new offices, only for her to tell DCI Jo Davidson (Kelly Macdonald) and buy her time to delay the raid.
However, fans are skeptical and many believe that Kate is still working undercover for AC-12, investigating the activities of the under-fire DCI.
Kate has joined up with Joanne at MIT (Picture: BBC)
While nothing has been confirmed on the show, fans believe they’ve found evidence they need to prove that Kate is indeed undercover in Line of Duty.
During Sunday’s episode, Kate recognised Ryan Pilkington – the member of the organised crime unit (OCG) who infiltrated the police at the end of series five, having killed undercover cop John Corbett (Stephen Graham).
While 18 months have passed since the murder, Kate is sure she recognised his face in the most recent episode after seeing him in the office.
Ryan could be one of the key figures on Line Of Duty’s sixth series (Picture: BBC)
Kate left AC-12 after the events of series five (Picture: BBC)
A fan also spotted that Kate had been doing some snooping work, after spotting his profile on her computer screen.
The Twitter user wrote: ‘Kate knows!! #LineOfDuty did anyone else clock this??’
Could the revelation prove that Kate is still under cover for AC-12? And will she be able to prove the identity of OCG member Ryan?
Elsewhere, fans also believe they spotted a familiar face on Sunday, with a mysterious bearded man making an appearance right at the end on the episode
The figure hands off a burner phone to Kelly Macdonald’s under-fire Jo Davidson, and viewers think it could be Neil Morrissey’s character Nigel Morton in a fake beard.
Sunday’s episode saw the investigation continue into the murder of Gail Vella. One piece of evidence which could be vital is a partially downloaded audio clip featuring a familiar voice – and fans believe they’ve worked out who it is.
There’s still so much to be discovered, and there are plenty of questions that still need answering.
Line Of Duty continues Sundays at 9pm on BBC One.