When the three sisters died in a tragic coach accident in 1861, alongside their beloved nanny Mildred, they thought it was obviously some sort of cosmic ‘glitch’.
Taking matters into her own hands, Rebecca makes an application to the Ghost Council, the high court of the afterlife, requesting them to return her and her sisters back to the world of the living. But the afterlife is much like real life, bureaucracy is slow and forms get lost or misfiled. For the sisters, the wait was 150 years, stuck in limbo.
Upon their return to the estate, the girls quickly realise their home has been turned into a school. They now find themselves in a world unbeknown to them, and under the watchful eye of their colourful, ghostly guardian – Agatha (Julie Eckersley). The sisters can stay under one circumstance – no one is to find out their secret otherwise they will be sent back to the afterlife.