The children of North End, Boston, play in the shadow of an enormous steel tank of molasses. The thick, sticky sugar syrup is being used to make munitions for the First World War. When a worker notices dark molasses seeping from the tank he warns the company that there could be a leak. But the man in charge, Arthur Jell, has more important things to worry about: schedules to meet and profits to make. Besides, it's only sugar. How dangerous could it be?

For the sources, see the show notes at timharford.com.

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In the early 1900s, Sir Arthur Vickers keeps the magnificent Irish Crown Jewels safe under lock and key at Dublin Castle. When the jewels disappear, the King rages, the police investigate, and even Sir Arthur Conan Doyle gets involved. No one is ever charged and no jewels are ever recovered. Except, we have a very good idea of who took them, and why the truth has stayed buried.

For a list of sources, see the show notes at timharford.com

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When John Darwin walks into a shop in London, it causes an instant stir. After all, John Darwin has been dead for five years. He claims to have amnesia, but everyone - from the police and the media to his insurance company - suspects he is lying. No one can prove a thing, until a young woman at home with her baby thinks of something everyone else has missed.

For the show notes, see timharford.com

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