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The Mud Men are in Blackwall, a stones throw from London's financial district. Blackwall's heyday pilgrims, explorers and shipbuilders rubbed shoulders with emigrants and convicts waiting for passage to the new world.
It's time for a road trip as Johnny and Steve head to the home of the industrial revolution, the West Midlands. Right in the heartland of heavy industry, Steve heads off to find out more about making padlocks, his personal obsession.
At the British Museum, the Mud Men see how medieval traders kept their accounts and tallies. Then, Steve heads off to New Billingsgate Market to find out about what went on in the original fish stalls.
Their explosive 17th century find sends the boys on a quest to discover more about the English civil war and its weapons, but first they must leave their mortar cannon ball at the National Army Museum to make sure they aren't carrying around a bomb.