With Hetty framed by Sheila and locked up by Matron it looks like she won't get the escape letter to Matthias in time for their midnight breakout.

Part two of a musical special. It's Christmas Eve and Hetty and Gideon are on a charity mission to London when they are caught up in a street gang that is run by Hetty's oldest, most frightening enemy.

Hetty is amazed to get some very unexpected help as she writes her life story and looks back on her experience as a Foundling and a servant.

Hetty continues to write the story looking back on her life, while others face life-changing decisions of their own.

The gang realise they need to break through a wall to get to the jewel – but can they do it without being discovered? And what will Agnes do when she finds out Gideon’s been lying to her?

Part one of a musical special. It's Christmas Eve and Hetty and Gideon are on a charity mission to London when they are caught up in a street gang that is run by Hetty's oldest, most frightening enemy.

Hetty and the gang find crucial clues to the Dawn Star, although Flo and Ambrose are now watching them closely and Lady Grenford appears to know more about the diamond than she is letting on.

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.

The gang follow clues as they search for the Dawn Star, not realising that Ambrose is looking for it, too. Rosamund surprises everyone when she brings an old enemy back to the house.

Hetty and Sheila are forced to work together in the infirmary. The boys compete in a series of gruelling army tests in order to win a place as a drummer boy in the army.

Hetty's plan to help Nurse Winterson backfires when an innocent man is accused of theft.

Hetty steels herself to face her old enemy, while Lady Grenford introduces the family to her handsome young grandson, Robert. Emily is excited when a suffragist visits the house.

Agnes's job is put at risk when her family secret is revealed, while Emily argues with her father about her future. Jack thinks Gideon has betrayed him.

The gang are in danger when Rosamund leaves Lady Grenford and Ambrose in charge. Hetty finally cracks the code - but can the gang get to the Dawn Star in time?

Now on the streets, Hetty is shocked when she discovers her greatest enemy in a desperate situation. Meanwhile, back at Calendar Hall, Harriet and Mathias’ wedding plans hit crisis point.

Mathias is back and a shadow of his former fearless self. With the hospital on lockdown in order to mass-produce toys that are supposedly earmarked for charity, the children start falling ill.

Hetty is determined to discover what secret Matron is hiding in the basement.

Hetty discovers that others are planning a daring visit. Meanwhile, Vince blackmails Nurse Winterson to get special treatment.

Lizzie discovers a secret tunnel with a clue, while the gang races Ambrose to find the jewel, and Hetty fears that Ashok is growing too friendly with Lady Grenford.

Kindly nurse Winterson is sacked by Matron so Hetty convinces the children to go on strike. Will Matron capitulate before the choir debut their new anthem in order to win a £100 donation for the school's organ?

Hetty helps a street girl who breaks into the hospital looking for safety. However, they are unaware that Matron has her own reasons to find the young girl first.

It's Hetty and Gideon's borrowed birthday but how can Hetty celebrate with her brother when girls are not even allowed to mix with the boys?

Hetty plays a practical joke on Matron that has frightening consequences for everyone.

An accident in the kitchen forces Sheila to choose between loyalty to the cook or her own ambition, while Jack is stunned to discover the identity of a thief. Hetty reveals she doesn't trust Mrs Brody - but is this a mistake?

Hetty and the gang race back to Calendar Hall to stop Ambrose before anyone gets hurt, and to discover the truth about what really happened at the house.