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July 22, 2025 40 mins

Introducing...The Lab Detective


Kathleen Folbigg was known as ‘Australia's worst female serial killer’ - she’d lost all four of her infant children and was convicted for killing them.


Until, after spending decades in jail, a scientist working in a lab uncovered the truth behind the deaths. 


The Lab detective is the story of a shocking miscarriage of justice, and an investigation into why Kathleen’s story might not be the last.


This is episode one of four. You can listen to the entire series today by subscribing to The Observer+ on Apple Podcasts or Spotify or by downloading the Tortoise app. To listen, search for The Lab Detective wherever you get your podcasts.


To find out more about The Observer:


  • Subscribe to TheObserver+ on Apple Podcasts for early access and ad-free episodes.
  • Head to our website observer.co.uk 
  • Download the Tortoise app – for a listening experience curated by our journalists


Reporter: Rachel Sylvester

Producer: Gary Marshall

Music supervisor: Karla Patella

Sound design: Rowan Bishop

Podcast artwork: Lola Williams

Executive producer: Basia Cummings


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