*Warning: spoilers ahead for Line of Duty season 6*
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Fans of the BBC’s Line of Duty finally found out who the mysterious H was, as series six came to an end in an epic finale.
After weeks of clues and multiple red herrings, the “Fourth Man” was revealed to be DSU Ian Buckells (played by Nigel Boyle).
Following the finale, Jed Mercurio revealed why it was so important for Buckells to be the very man, who had eluded AC-12 for so long.
“I suppose it was really down to the decision to kind of hold him to account mid season. There were suspicions around him in the first few episodes, AC-12 get him in and they charge him, off he goes to prison and it feels like he’s done and dusted,” he told Craig Parkinson during an episode of Obsessed With… Line of Duty on BBC Sounds.