Sundance TV has greenlit a six-part limited series thriller, Liar, the network said Friday.

The series, which stars Joanne Froggatt (Downton Abbey) and Iaon Gruffudd (Fantastic Four), explores the cost of deceit both on a couple and their friends.

The series will be executive produced by Harry and Jack Williams (Fleabag, The Missing, One of Us), and James Strong (Broadchurch) who will produce.

 “Liar is that rare combination of a thoughtful and emotional exploration of the human condition, and a page turner,” said Joel Stillerman, president of original programming and development for AMC and SundanceTV. “The Williams Brothers have created something both relevant and compelling, attributes that the SundanceTV audience respect and embrace.”