With the crazed Lord Cerebrus incarcerated normality refuses to reassert itself as Ash, Katie, and Crowley are thrown into a family feud! With an estranged husband and wife up against a strange saboteur, will science or speculation prove pivotal? When Mum and Dad go mad, the kids have it bad, and it's Ben's bizarre behaviour coupled with bawling Bonnie's bother that leads Team X to delve deeper into the Lees prohibited past! Who's behind this unseen unrest? Can Ash and Katie set aside their differences and intuit the identity of THE INVISIBLE INTRUDER?