It's the question that has been haunting Line Of Duty fans, and Ted Hastings, for several series - who is the remaining fourth person?
And Alison Hammond confirmed their identity will finally be revealed during Sunday's finale as she announced H will be appearing on This Morning next week.
The presenter, 54, signed off from Friday's episode of the ITV show teasing viewers that H will be 'on the sofa' on Monday, joking that she doesn't mean H from Steps.
At last: Alison Hammond teased that H will finally be revealed during Sunday's finale of Line Of Duty while signing off This Morning on Friday