Created and written by BAFTA- and Golden Globe-nominated producers and screenwriters Harry and Jack Williams, and featuring "Downton Abbey" star Joanne Froggatt and "Fantastic Four" actor Ioan Guffard, "Liar" tells the story of two people whose initial attraction leads to far-reaching consequences for them and their friends and families. Laura Nielson, a smart and capable teacher in the middle of a breakup, is set up on a date with recently widowed surgeon Andrew Earlham. However, the day after it is apparent that something has gone wrong, and the subsequent fallout rapidly spirals out of control, exposing the power of truth, deception and trust.