Cynthia Kirkpatrick

Cynthia Kirkpatrick arrives in Hollingford as the dazzling new stepsister Molly never had, all easy charm and quick wit, adored by every man who meets her. She flirts without quite meaning to, laughs at herself before anyone else can, and seems always to be holding something back behind the sparkle.

Keeley Hawes makes Cynthia's charisma feel like armor rather than vanity, letting flickers of self-disgust cross her face mid-flirtation. The writing refuses to let her be simply the pretty rival; she is generous, funny, and quietly ashamed, and Hawes plays all three at once without tipping her hand.