This week, Iain looks at an extortion plot involving a homemade bomb, a confusing ransom note and an unusual father-son dynamic. 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 [email protected]. Details of help and support with domestic abuse, gambling addiction and some other issues raised in today’s episode are available at bbc.co.uk/actionline.