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.

Jack has a romantic proposal in mind, but a new butler spells trouble for the gang, while Ashok reveals his secret - a priceless diamond hidden in Calendar Hall.