Line of Duty is back on Sunday, March 21 and for those who haven't been cramming in a decade's worth of AC-12 during lockdown, remembering what happened, even in the last series, can be a bit of a mystery.
After all, we've binged so much telly that who could blame us for forgetting something we saw two years ago?
Spoiler alert! If you're rewatching the older series, there are spoilers coming up for series five so click off if you want to rediscover it for yourself.
Line of Duty series six starts at 9pm, Sunday, March 21 and is on for seven weeks.
Here's what happened in series five
Firstly, and thank God, Superintendant Ted Hastings was proved not to be the mysterious H, despite the meddling of Gill Biggeloe - she even used his poor spelling of 'definitely' against him.
After the charges were dropped during a lengthy interview, Hastings was put back in charge of AC-12 but he is clearly not squeaky clean.
Just one of the many unanswered questions comes from the fact that Ted visited Lee Banks in prison, turned off his phones during the Eastfield raid and destroyed his computer. What's his secret?
Also, and maybe most importantly, DI Kate Fleming and DS Steve Arnott discovered that there wasn't just one H, but four. They discovered this while rewatching the video of Dot's dying declaration and saw he was communicating via Morse code, making four dots with his hand.
Dot, Derek Hilton (Paul Higgins) and Gill Biggeloe (Polly Walker) were unveiled to be three of the four corrupt policemen, there is still a fourth on the loose.
Meanwhile the big guest star of the series, Stephen Graham aka John Corbett, was deep undercover with the OCG, convinced by Gill that Hastings was the big bad.
Corbett was convinced that Hastings had something to do with his mother Anne-Marie McGillis’ death 30 years ago in Northern Ireland.
He was killed during the fourth episode during a set up by Lisa McQueen after she tricked him into thinking she was helping him unveil the sex trafficking ring they'd been working on. John's throat was slit by Ryan Pilkington (Gregory Piper).
Ryan who you ask?
Well, think back to series one where that annoying kid on a bike was ever so rude to Lennie James' bent copper, it's him!
And he's now training to be a policeman.
The cycle of corruption continues... only Ryan's in a police car instead of on a pushbike.
