Miss Endicott's life as a Conciliator is off to a bad start: a strange plot is being hatched in the tunnels beneath London, her headquarters have been torched, the child whose nanny she is by day has disappeared while following her at night... and to top it all, her mother, whom everyone believed dead, has reappeared! A blessing, or a curse? Can two Conciliators together defeat the mysterious master, assuming two Conciliators could ever work together?