1895 and an increasingly violent tide of political unrest is rising fast all over Europe. Special Branch's Inspector Thomas Pitt knows that they must find those responsible before England is overrun by reformists intent on overthrowing the government. When he finds himself in pursuit of a suspected terrorist, Pitt has no hesitation in following the chase all the way to France. But events take a sinister turn when Narraway, Pitt's superior, is accused of involvement in the death of an Irish informant and abruptly removed from office. Aware that her husband's own career is also in jeopardy if he is not reinstated, Pitt's wife Charlotte determines to help Narraway clear his name. As Charlotte and Narraway depart for Ireland and Pitt is drawn deeper into the investigation in France, it becomes clear that outside forces have conspired to separate them at a crucial time in the country's history. With no one else to trust can they make it back to England and stop the revolt before it's too late?