The extraordinary and chilling story of career conman Robert Freegard who masqueraded as an MI5 agent and fooled people into going into hiding, and the woman who fell for him, and then brought him down.

Coming face-to-face after being estranged for over a decade, divorced couple, Idris and Patricia, opt to revisit the past and traverse that treacherous path together, emerging open to new beginnings.

When intelligence agent Kathryn Woodhouse is suspected of betraying the nation, her husband - also a legendary agent - faces the ultimate test of whether to be loyal to his marriage, or his country.