Cover is an award-winning series investigating true stories of people living secret double lives, presented and produced by Mark Horgan and Ciarán Cassidy.

Series 1: Where Is George Gibney? An Olympic coach charged with child sexual abuse who never stood trial. Instead, he vanished. Series 2: Stakeknife. A man tasked with finding and killing alleged IRA informers who was, in fact, a British agent all along.

You can contact our production team about either series at cover@bbc.co.uk.

Credits for series 2: Stakeknife -

Reporter: Mark Horgan Produced and written by: Mark Horgan and Ciarán Cassidy Co-Producer: Paddy Fee Editing and Sound Design: Ciarán Cassidy Composer: Michael Fleming Sound mixing: Ger McDonnell Theme tune by Lankum Artwork by Conor Merriman Assistant Commissioners for BBC: Lorraine Okuefuna Commissioning Editor for BBC: Dylan Haskins

Cover is a Second Captains & Little Wing production for BBC Sounds.