A flash mob took place in Edinburgh a couple of days ago. There is nothing overly remarkable about this, except for the fact that none of the participants have any memory of agreeing to participate. Everything points to supernatural influence, but to what purpose? What first seems like a curious eccentricity rapidly takes on a darker significance. The investigators’ initial amusement turns rapidly to concern and then to dread as they uncover a sinister conspiracy that threatens the integrity of the entire nation