Jo Tiegan is an adopted 14 year old living with her mother Catherine (Judy Mcintosh), a school principal; father Andrew, an aspiring writer; and her younger brother Royce. While shopping with her father, Jo enters an antique shop where the owner, an eldery gentleman gives her an antique mirror, insisting that she was ment to have it. Later on that day Jo gets shocked when she sees a reflection of another girl, Louisa Iredale in the mirror and realizes that the mirror is a travel device to the past. While trying out the mirror, a drum of toxic ends up in the school archeology well. Next day, Jo's best friends, Mia and Jesse get splashed by the same toxic drum and end up in hospital.

Louisa travels to 1995 and comforts Jo, who blames herself for the sickness of her friends. She gets an idea to travel to 1919 and stop the toxic drum from getting into the well. Tama Williams, Jo's best friend does not believes her until she shows him that she can travell through time, but he is unable to go after her. While trying to go through Tama moves the mirror from it's alignment and breaks the position. Titus Iredale, Louisa's little brother, is convinced that Jo is a ghost until Jo and Louisa prove him wrong and make up that they are searching for buried treasure, just to get him to help them look inside the neighbour's well. The owner, Sir Ivor Creevy-Throne, catches them in their search. Later on, Sir Ivor's ward, Nicholas, who watched the incident in the yard. He wants to meet the world outside his bedroom.