While the story is based on the Pinkerton National Detective Agency's beginnings and the notable detective work of its first female detective, Kate Warne, the pages dedicated to the restoration of family through testing fortifies this tale's telling. Hannigan weaves parallel stories -- of Underground Railroad workers and undercover detective agents whose survival depends on wits, disguise, truth-seeking, courage, and trustworthiness. But when identity is hidden, the truth is not so easily revealed and false accusations create barriers of mistrust that only proof and trustworthiness over time can tear down. A fascinating setting that provides a colorful backdrop for meaningful conversations about redemption, freedom, and love.