Worried that his mother will pressure him into a marriage with someone he does not love, Colambre decides to leave the London social scene and visit his ancestral home in County Wicklow in Ireland.
It is generally known that Lady Dashfort is looking to ensnare a new, rich Irish peer for her equally unscrupulous daughter, and by any means necessary.
Chance intelligence from a former maid in the Clonbrony household reveals to Lady Dashfort that Lord Colambre is, in fact, in love with his cousin, Grace Nugent.
To discourage the match, Lady Dashfort slyly lets slip that Grace was born out of wedlock, and is therefore illegitimate.
This is confirmed by letter by his mother, who while a social climber and generally frivolous, is very loving to Grace and has never told her about her parentage.