Three refined but spirited Victorian sisters who died in the mid 1800s are given a second chance to experience life as teenagers 150 years later. The Ainsworth sisters find themselves transported to a new life as living ghosts. Arriving back at their old house, now a private boarding school, they must work out why and how they went from being dead to being seen by humans, while being able to levitate and walk through walls.

Still attempting to settle into life as living ghosts, the sisters begin to discover the modern advantages to their new environment, and there is much fun to be had. Meanwhile, desperate to fit in, Rebecca identifies Christine and her friends as the route to popularity.

Rebecca and Sophie have an almighty argument when one mistakes an innocent moment for sisterly betrayal. At the same time, Hazel struggles with a newfound ghostly power that allows her to hear what people are thinking.

A face from the past during a history lesson leads Hazel to search for and confront a memory from her days as a young girl. She embarks upon a private mission that not only sees the return of an old friend but also a less welcome ghostly guest. Meanwhile, Rebecca is excited to become David's study buddy in English class.

Sophie is upset to learn that her best friend Charlie is being bullied by Ainsbury's resident con artist, Maz Baxter. The Ainsworth sisters join ghostly forces to take on the bullies and rid Ainsbury School of a complex homework laundering operation.

All is running smoothly for Ainsbury School's `Week of Culture' until a dusty antique box in the drama class is opened releasing a cheeky spirit called a Baharee. Driving people to do strange things, the Baharee soon causes chaos amongst the students and teachers.