Sue Trinder, an orphan raised among a den of fingersmiths (petty thieves), is entwined in a devious plot hatched by the charismatic con artist known as Gentleman. Tasked with becoming the maid to the sheltered and wealthy Maud Lilly, Sue's role is crucial to Gentleman's scheme of marrying Maud for her fortune before condemning her to a lifetime in an asylum. The plan proceeds until Sue's growing empathy for Maud and complex feelings entangle her in a web of betrayal, affection, and moral dilemma. In this twist-filled Victorian thriller heritage becomes a questionable tether, love is a dangerous game, and trust is the ultimate gamble.