<p>On the 14th of May 2018, Ana Kriégel left her home in Leixlip, Co Kildare, with a promise to her father that she wouldn't be long. </p><p>But Ana never came home and her disappearance sparked a three-day search of a local park, the last place where she had been seen walking with another child. </p><p>It was a missing person's case that gripped the nation as everyone hoped the smiling girl in her favourite black hoodie would be found. What happened would become one of Ireland's most disturbing and unsettling cases. </p><p>In this episode of Lines of Enquiry, John Sweetman takes us back to those dark days of her disappearance, and why her killers will never be named.</p><p>Presented by John Sweetman</p><p>Created by Darren Cleary</p><p>Episode Written by Siobhán Maguire and Eoin Brennan</p><p>Script Edited by Eoin Brennan</p><p>Produced by Siobhan Walsh</p><p>Produced by Siobhan Maguire</p><p>Executive Produced by Eoin Brennan</p><p>Executive Produced by Ruth Fitzsimons</p><p>Sound Design and Editing by Neil Kavanagh</p><p>Audio Editing Support by Ed Smith</p><p>Marketing Support by Laura Bracken and Róisín Reilly</p><p>Social Support by Mark Hayes and Robyn Ree</p><p>Artwork and Graphics by Eric Rowntree</p>