In 1848, Tessie and Finn struggle each day and dream of life far away in the New World, but when Tessie is attacked by an underworld figure known only as the Angel of Bishopsgate, her fight for survival has only just begun.

Separated from her beloved Finn, and oblivious to why the Angel wants her dead, her only clue points home to Dublin, and a past she thought would never find her.

Battling her way from the treacherous Old Nichol slums, and navigating the sparkling upper-classes, how will Tessie survive this game of cat-and-mouse with the city's most notorious villain?