The trailer for one of the most anticipated TV dramas in recent years has been released - drumming up excitement throughout Northern Ireland.
The advert for the drama about killers Colin Howell and Hazel Stewart, who murdered their partners, aired on ITV over the weekend. It gave a sneak peek of what's in store in the three-part drama series.
The Secret tells the real-life story of how Coleraine Sunday school teacher Stewart and her lover Howell turned into murderers in 1991.
Dentist Howell and Hazel, who then went under her married name of Buchanan, became embroiled in an affair and plotted to kill their spouses, Lesley Howell and Trevor Buchanan.
In one of the scenes, actor James Nesbitt, who plays double 'driller killer' Howell, is seen singing and preaching from a pulpit while in another he appears alongside Genevieve O'Reilly, who plays Hazel, as they discuss removing the bodies.
The drama is based on the book, Let This Be Our Secret, by Deric Henderson, the former Ireland editor of the Press Association.
The cast and crew have been spotted filming the production in various locations around Northern Ireland, including Carrickfergus, Groomsport and on Castlerock beach.
The bodies of mum-of-four Lesley and policeman dad-of-two Trevor were found in a car filled with fumes in Castlerock in May 1991. Howell and Stewart conspired to make the deaths of the couple look like a suicide pact.
For almost 20 years they lied to families, police and friends until Howell confessed in 2009.
The Secret was written by Bafta-winner Stuart Urban and directed by Nick Murphy.