In the August of 1976, a young Dublin woman named Elizabeth Plunkett, went missing while on holidays in Brittas Bay, Co. Wicklow. Her friends and family searched through sand dunes, forests and along the roads for a trace of her - All to no avail.

Across the country, another young woman Mary Duffy read a newspaper article about Elizabeth Plunkett’s case with tears in her eyes. A few days later, she too vanished.

In this episode of Lines of Enquiry, John takes us back to Ireland’s first serial killers and the cross country man hunt to find them and finally bring them to justice.

This episode contains mention of rape and sexual assault. If you are affected by any of the issues raised in this podcast help is available. Contact Dublin Rape Crisis Centre’s National 24-Hour Helpline on 1800 77 8888.

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Presented by John Sweetman

Created by Darren Cleary

Episode Written by Siobhan Walsh and Eoin Brennan

Produced by Siobhan Walsh

Produced by Siobhan Maguire

Executive Produced by Eoin Brennan

Executive Produced by Ruth Fitzsimons

Sound Design and Editing by Neil Kavanagh

Audio Editing Support by Ed Smith

Marketing Support by Bríd Walsh and Róisín Reilly

Social Support by Mark Hayes and Robyn Ree

Artwork and Graphics by Eric Rowntree