A new reality has been created by the temporal disruption through the causal nexus. Welcome to 1978... with a difference.

Anne Travers, co-founder of UNIT, and her husband, Bill, are celebrating their wedding anniversary in France, which is the perfect opportunity for Anne to catch up with an old friend; Madeleine Bonnaire.

Meanwhile, Victor Bonnaire is not at all happy to hear of Anne's visit, not least of all because he's always viewed Anne as a bad influence on his daughter.

What seems like a simple case of familial friction takes a bleak turn when a local unknown threat makes the news. Suspicion abounds and throws Anne and Bill into an unexpected mystery. What is the strange threat, and does it present a direct danger to anybody at the institute? Or to those who ask too many questions? Unable to walk away from her friend, Anne has no option but to investigate, little knowing she’s about to face the darkest shadow of her life so far.