This week, Iain dives into the case of Glennon Engleman – aka ‘The Hitman Dentist’. It’s 1958 in St Louis, Missouri, when Glennon finds himself drowning in debt. His solution? A murder-for-profit scheme that flies under the radar from police for more than two decades. Along the way, Glennon leaves a trail of destruction in his wake. That is until he makes a crucial error that leads investigators straight to his door.

Murder They Wrote with Laura Whitmore and Iain Stirling is available weekly on BBC Sounds. Subscribe now so you never miss an episode. Email us at lauraandiain@bbc.co.uk and join the conversation using the hashtag #lauraiainpodcast.