The theme song, which was co-written by Chris Harriott (music) and Dennis Watkins (lyrics), was sung by Nadine Weinberger.

In 1919, Louisa's father is a senior official in the New Zealand Government's Health Department, and their family house is a mansion with servants.

When Jo and Louisa meet, there is instant rapport between the two girls and they become firm friends, and life changes for them both as they become caught up in a web of intrigue.

The affected students become extremely ill, and, when it is discovered that the container has the date 1919 on it, Jo is worried that her friends' sickness is her fault because of going through the mirror to 1919.

Back in 1919, Jo asks Louisa to help her find the container so that they can move it, to prevent the later disastrous events happening in 1995.

The well is located in the yard of a neighbouring house which is rented by a British visitor to the area, Sir Ivor Creevey-Thorne.

Jo and Louisa enter the yard and look down the well, but are disturbed in their actions by Sir Ivor Creevey-Thorne.

Intrigued by colour photographs, Nicholas checks for information about the Russian Royal Family.

Nicholas reveals to Jo and Louisa that he is Alexei Nikolaevich, the son of the Tsar, and that it is his family who had been executed.

Jo asks her school friend, Tama, a science student, to assist her and Louisa and Nicholas.

Later, Nicholas, who requires his family signet ring as proof of his identity, tells Jo that the container of toxic waste is safe, as he has hidden it in the well.

Jo is horrified at this and now considers Nicholas to be the person responsible for the harm which had befallen her friends at the school.

Sir Ivor holds a ball, to which members of the New Zealand's high society has been invited (including Louisa's parents).

During the dance, Nicholas and Jo kiss each other, and Louisa and Tama shyly hold hands.

This is in homage to Lewis Carroll's book, which also involves a girl travelling through a mirror, albeit to another world.

Sir Ivor's house was a former building named "Brendenwood" at the grounds of Sacred Heart College in Lower Hutt.

The series timeline (for the era in which Louisa and Nicholas live in 1919), was dated four years after the bodies of most of the Russian imperial family, the Tsar, Tsarina and three of their daughters, were discovered.