The Trenchard family have recently ascended to the aristocratic society of London's Belgravia, but a decades old love affair comes back to haunt them and jeopardise the happiness of many.

Anne decides that honesty is required, and hopes that seeking confession with Caroline will appease her guilt and lay to rest the ghosts from her past. Anne has sorely underestimated Lady Brockenhurst, who sets about unearthing the families' secrets.

Anne and James are at loggerheads following the Brockenhurst's soiree. James is worried that people will begin to guess the heritage of Charles Pope. With Oliver fixated on the origins of his father's protégé, Susan plans a covert trip.

Tensions rise when Caroline organises an outing for Lady Maria and Anne, which sees the women compromised. Susan's indulgent behaviour catches up with her, and Ellis begins to show her true colours.

A jealous Oliver threatens to ruin the lives of many as he makes a shocking discovery about Charles. John's plans are jeopardised, making him dangerous; he enlists the help of the Trenchard staff to stoop to new lows.

Charles receives a mysterious olive branch, but the offer of reconciliation places him in grave danger. James must find a way to defend Charles' honour before Lady Maria is lost to him forever.