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.

Hetty and the gang play a prank on Sheila, but it has disastrous consequences when a young visitor with a secret arrives to stay at Calendar Hall.