'Pretty Boy' Flloyd. John Dillinger. The Barkers. A lot of well-known gangsters emerged in the 1920s and 1930s; all of them criminals known as 'public enemies' to the government, and highly sought after by authorities, as you can imagine. But lesser known are the hideouts these criminals used -- and the people who ran those illegal safe houses. This is the story of husband and wife, Herb and Esther Farmer, who ran such an establishment.

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When Catherine Flannagan and her younger sister Margaret moved to Liverpool from Ireland in the late 1800s, they were among the tens of thousands of poverty-stricken Irish laborers and their families who left Ireland during the potato famine to find work in Britain during the Industrial Revolution. To make their money, Catherine and Margaret established and ran a boarding house. In short time, the house was filled to capacity with lodgers. But there was one problem: guests were dying in suspiciously similar circumstances.

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Nicola Sacco and Bartolomeo Vanzetti were Italian immigrants who were – controversially – convicted of murdering Alessandro Berardelli and Frederick Parmenter, a security guard and a payroll clerk, during an armed robbery of the Slater and Morrill Shoe Company in Massachusetts. About a century has passed and experts -- and armchair experts, too! – continue to debate this case, but not whether they did or didn't do it. They continue to debate one very big thing: whether or not Sacco and Vanzetti received a fair trial.

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