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*WARNING: CONTAINS SPOILERS FOR LIAR SEASON ONE*
The 39-year-old actor portrays the character Laura Nielson - a teacher doing everything in her power to prove she had been raped by a well-respected surgeon she dated called Andrew (Ioan Gruffudd).
The second season will begin this evening at 9pm and Joanne spoke to Holly Willoughby and Phillip Schofield on This Morning (this morning).
She told the ITV hosts that the writers of the hit series - Jack and Harry Williams - always intended on making it run over two series' but they wanted to see what the public's reaction was first before filming the second season.
She explained: "The hope was to see whether we could tell this story over 12 episodes. It's really exciting, I think they've done a terrific job."
When she was asked whether there would be more on the horizon, she replied: "No more Liar, that will be the ending. It will be very exciting."
In the first series, as Andrew's criminal activity unfolded, it turned out that behind his charming facade, he was a man who had drugged, assaulted and raped at least 17 women.
Laura found out about all of this when she uncovered secret recordings that Andrew had made of each of his victims, including DI Vanessa Harmon (played by Shelley Conn).
She handed this evidence to the police and with Andrew's son, Luke, realising the truth about his dad and a warrant out for his arrest, the surgeon goes on the run.
Harry and Jack Williams confirmed the second series will be a classic whodunit, exploring a list of suspects over Andrew's death. Could it be Laura? Andrew's son Luke? Or many another one of Andrew's victims?
"There are certainly a few suspects and we hope to explore that further," Harry told The Mirror. "Andrew has been missing for several weeks and then we see his dead body in the empty marshlands. The question is, what happened in those missing weeks that led to Andrew's demise?"
Brother Jack added: "We don't want to do it cynically - it will be a new set of lies and perceptions."
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