It's the day of the fair and Gideon makes a surprising discovery about Jack, while Hetty realises Mrs Brody is out to get her. Sheila and Constance battle to become the Festival Queen.

Hetty and Gideon search for proof of Jack's innocence, while Emily discovers Mr Buscombe has a secret - but is he telling the whole truth? Lady Grenford has a startling plan for Emily and Robert.

There's an explosive finale at Emily's 16th birthday party when Hetty fights to reunite Rosamund with her long lost son, while Lady Grenford will stop at nothing to force Emily and Robert's engagement.