After weeks of agonising negotiations, Muriel McKay's kidnapper finally agrees to collect a ransom. The police see their chance to catch M3 and rescue Muriel. They devise an elaborate plan, with undercover officers posing as Muriel's family members, to make the drop.

Have they finally out-manoeuvred the elusive M3?

Worse Than Murder - A tragic case of mistaken identity that shook Britain and launched a tabloid war.

One winter's night in 1969, kidnappers targeting Rupert Murdoch's wife abducted Muriel McKay by mistake. She was never seen again. Jane MacSorley investigates this shocking crime which baffled police and, more than 50 years on, remains unresolved.

Presented by Jane MacSorley with Simon Farquhar Produced by Nadia Mehdi, with extra production from Paul Russell and Megan Oyinka Sound design and mixing by Basil Oxtoby Story editor: Andrew Dickson Executive producers: Neil Cowling, Michaela Hallam, Jago Lee and Rami Tzabar Development by Paul Russell Voice acting by Red Frederick Original music composed by Richard Atkinson for Mcasso With special thanks to Simon Farquhar, author of 'A Desperate Business: The Murder of Muriel McKay'

A Fresh Air and Tell Tale production for BBC Radio 4