Line of Duty viewers are certain that Kate Fleming is working undercover as they think she's suspicious of Ryan Pilkington.An eagle-eyed noticed a clue after watching Sunday night's dramatic second instalment of the sixth series.Fans were gutted as they found out Kate is no longer working on AC-12, but it seems she has a mission of her own.She seemed to notice the face of a young officer, who happened to be the youngest member of the organised crime unit (OCG) as his picture appeared on her computer during one of Sunday's scenes.Line of Duty fans know that he managed to infiltrate the police at the end of the last series, but that wasn't the first time the character has been on the programme.Ryan was seen in the first-ever series on the.
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