A 56-year-old widower who marries Lucy Graham, infatuated by her youthful beauty, though he remains unaware of her past.

The hot-headed teenage daughter of Sir Michael Audley who is skeptical of her father's marriage to Lucy and has unrequited feelings for her cousin Robert.

Sir Michael's nephew, initially an idle barrister, who becomes central to the unfolding plot as an unexpected amateur detective.

The son of a wealthy father who leaves England to seek his fortune in Australia, returning to find his life drastically changed.

George's stern and uncompassionate father who reacts harshly to George's marriage, setting key events into motion.

George's devoted sister, whose determination to find her brother wins the respect and affection of Robert Audley.

Helen’s financially struggling father, a former sea captain, who plays a part in the complex family matters intertwined with Helen's life.

A woman involved in a critical conspiracy concerning Helen Talboys and her past, motivated by financial necessity.

The son of George, raised by his grandfather, who has yet to form a familial bond due to his limited interaction with his parents.

Cousins and later spouses who use their knowledge of Lady Audley's secrets for personal gain, revealing the complexities of their characters.