After their mother unexpectedly dies, Emma and Phoebe are shocked to learn her death is suspicious. Reeling from recent events, and with worsening insomnia, Emma is forced to come clean to her husband Robert about her past.

As Emma's life continues to unravel, her unsettling nighttime behaviour escalates so she decides to investigate what's happening to her. It becomes apparent that Emma may pose a danger to her own family which has devastating consequences.

Emma finds solace in a new friendship as Phoebe takes her place in the family home. Delving into the past, a resurfaced childhood memory sheds light on Phoebe's motives, causing Emma to question their bond.

As Emma comes under the spotlight, she becomes increasingly convinced of her sister's treachery. Before she can get answers to a newly emerging memory, tragedy strikes and Emma begins to mistrust herself.

Realising her home has been infiltrated by a wolf in sheep's clothing, and her family is in danger, Emma races to save them. Can she prevent a shocking vengeance against her family? Or will history repeat itself?