Downton Abbey alumna Joanne Froggatt and Ioan Gruffudd (Fantastic Four) are set to star in Liar, Sundance TV’s new six-part thriller series from Fleabag producer Two Brothers Pictures. The series is being produced in conjunction with ITV in the UK.

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Created and written by BAFTA and Golden Globe-nominated producers and screenwriters Harry and Jack Williams, Liar tells the story of a night that changes the lives of Laura Newell (Froggatt) and Andrew Ellis (Gruffudd) forever.

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Laura is a smart and dedicated teacher, not long out of a relationship and unsure about getting back on the dating scene. Andrew is a renowned surgeon whose son is a student at Laura’s school. An initial attraction leads to a date, but neither fully realizes the far-reaching consequences that their meeting will have on each other or their families. Truth and consequences go hand in hand in a tense and gripping thriller that examines both sides of a relationship and both sides of the truth. Are there really two sides to every story? Liar explores the devastating cost of deceit on both the couple and their friends and family, as secrets and lies are laid bare.

Harry and Jack Williams will executive produce via their Two Brothers Pictures. BAFTA winner James Strong (Broadchurch, The Great Train Robbery, 11-22-63) is lead director and also will executive produce. Eliza Mellor (The Living and the Dead, Poldark, Death Comes to Pemberley) will produce. Sam Donovan (Humans, The Living and the Dead, Utopia) will direct episodes 4-6. Filming will begin in London and Kent in November. ITV’s new Head of Drama, Polly Hill, will oversee production on behalf of the broadcaster.