Three curious and plucky children looking for adventure find a challenge to explore the cellars of a row of terraced houses; twin girls and their older brother – known as the Trio Theo - pass through connecting trap doors built into the walls of each basement.
Fantasy and mischief turn into an experience of fear and terror as the three find themselves confronting the horrors of the past, through their efforts to release the ghost children who are alone and captured for eternity by the evil power of the ‘man in black’!
Their first encounter with the supernatural is when they emerge from the cellars to the caves and hovels under the street and discover the wartime ghost orphans, who warn the three children - Seb, Elle and Phe - of the perils of the faraway land and its occupants.
The trio are drawn into the horrors of past centuries, one awesome experience after another, by their belief that they can, somehow, alter the course of history in a minor way, but a major help for the trapped and tortured spirits.
However, they are accompanied throughout their travels back in time by the wrath of Jess…Jess the evil spirit, the sister of ‘the man in black’….but also the handmaiden of the Devil.
Nevertheless, goodness prevails and the trio triumph, but, they emerge bereft of innocence and with a new taste for meddling in the past, albeit for the best of motives.