Season 1 focused on DCI Rachel Carey (Holliday Grainger), who accidentally stumbles into a case where someone outside the government is using Correction in hopes of exposing it. First, the helmet camera footage of a man guilty of war crimes is manipulated, so he goes free, then the CCTV footage of him at a bus stop is altered to make it look like he attacked and kidnapped his lawyer. As Carey races to uncover what exactly is happening here, the government program, led by DSU Gemma Garland (Lia Williams) on the U.K. end and Frank Napier (Ron Perlman) on the U.S. end, covers the whole thing up, including murdering its own citizens.
In the finale, Carey is offered a position with the program for her talents at recognizing Correction; defeated, she seems to submit to “if you can’t beat them, join them.” Season 2 picks up a few months later, where Carey is now in charge of “Mapping,” a tedious middle management job she can do in her sleep. But Garland has a good reason for keeping her in bureaucratic limbo; despite the ambiguity of the finale, viewers quickly learn Carey is compiling evidence to someday bring this all down from the inside, a stealth operation inside her own home, where she is watched 24-7-365 by her bosses.
Carey’s chance to get out of Mapping comes when an up-and-coming MP, Isaac Turner (Paapa Essiedu), perhaps foolishly, dares the Chinese tech company vying for the U.K.’s security contract to go after him, ignorant of Correction’s existence or that most high tech countries have access to it. A political nightmare follows: The MP does a remote interview where the signal is hijacked, unknown to the BBC. Turner is made to praise the Chinese tech company and spout their party lines hours after he publicly warned against them.
