Then You Run tells the story of Tara O'Rourke, who, when she kills her estranged father in a drug fuelled rage, her best friends are forced to flee across Europe in search of Tara's long-lost mother. Along the way, the girls have to navigate depleting funds, awkward romances and an inconvenient pregnancy but the biggest danger comes from Tara's uncle, Reagan because the girls made the mistake of stealing Reagan's drug stash and he happens to be the most feared gangster in Rotterdam. And all the while, the spectre of a mythical serial killer known as The Traveller inches ever closer.