Jed Mercurio talks about writing for Line of Duty as well as sharing scripts from the series.
Here's what he said about Keeley's character, Lindsay Denton:
Line of Duty had originally been conceived as a returnable drama, with the premise being that the fictional anticorruption unit AC-12 would move on to a new case in each series, centred on a high-profile antagonist accused of corruption. The character of Detective Inspector Lindsay Denton would be a contrast to DCI Tony Gates (Lennie James) from Series 1, and we would also depart from the open mystery whereby the audience witnessed Gates’ secrets and dilemma while AC-12 played catch-up. Denton hides her secrets from both the audience and AC-12, making Series 2 more of a whodunit (and whydunit). It was also very important for the long-term development of the returning characters that we portrayed more of their personal lives.
You can download the scripts HERE.