Mary Lairre (Nicola Walker), the ghost of a sixteenth century French nun murdered at Borley Rectory and rendered corporeal by the mysterious Department, is joined by Parker (Phoebe Fox), a character whose magical abilities rely upon her transforming her entire personality as circumstances require.
In GLAMIS, Lairre and Parker accompany their boss Johnson (Tim McInnerny) to Glamis Castle in Scotland, where a secret door has been discovered. Said door leads into a folkloric dimension, where monster hunter Libby Ward (Jana Carpenter) is tracking a dangerous monster and has kidnapped an innocent American tourist to use as bait. Time bends, dimensions fragment and our heroes realise that the monster Ward is hunting may be a lot closer to home than they thought…