Watch: Nesbitt in The Secret trailer of killer dentist Colin Howell and Hazel Stewart movie
This is the first trailer for the story which gripped Northern Ireland about the killer partnership between a respectable dentist and a Sunday school teacher.
The drama about Colin Howell and Hazel Stewart who murdered their partners in 1991 will be shown in a three-part drama series.
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.
The Secret tells the dramatic story of how Ballymoney dentist and lay preacher gassed his wife Stewart's husband and made their deaths look like a suicide pact.
The couple each received a life sentence for their roles in the 1991 murders in Castlerock.
James Nesbitt takes on the role of Howell and is seen singing in the ITV clip and is also shown discussing the murder plot.
He appears alongside Genevieve O'Reilly, who plays Hazel.
The drama is based on the book, Let This Be Our Secret, by Deric Henderson, the former Ireland editor of the Press Association.
The first episode is to be broadcast on ITV on Friday April 29 at 9pm.