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.

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?

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.

Matron's sister arrives to deliver bad news about her mother. Hetty's feisty little borrowed sister Eliza arrives at the hospital and, like Hetty, clashes with Matron.

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 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.

A distraught couple come to the hospital to reclaim their child. Gideon plans on escaping in search of his parents, but Vince and Judd have other plans.

It is open day at the hospital, and Matron tasks Hetty with looking after Lord Upton's snooty daughter Charlotte. Matron has plans to send Hetty to India as Charlotte's maid.

When Hetty finally escapes from the hospital, Matron goes on the warpath and thinks she knows where to find her. The gang try to expose Matron's true intentions behind Hetty's planned trip to India.

Hetty risks getting into serious trouble with Matron when she makes a desperate promise.

Hetty is shocked when a wealthy couple want to adopt one of her friends.

Gideon tells a lie, which gets Hetty into trouble, and Matron has mysteriously disappeared.

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

A tragic accident brings Hetty and Sheila together to find the truth.

Hetty is excited when an explorer talks about her adventures, and there's a snake on the loose.

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

Hetty discovers news that will change her life forever.

Will Hetty be able to keep the truth about her real mother a secret?

Hetty makes a daring escape. She soon learns the streets of London are a dangerous place - how will she survive?

Hetty searches the streets of London for Ida, not realising Matron has her own plans to find her. Will the police reach Hetty first, before Matron's friend gets rid of her forever?

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.

Will Hetty find the secret book that could bring Matron's downfall? And why are so many of the foundlings falling ill?

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

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

Special visitors to the hospital are caught up in a fight among the boys, while Hetty tries to discover what Matron has planned for her.