Tasha and Jack are in the middle of a romantic anniversary dinner when they are interrupted by his ex-wife, Jen. Tasha feels a growing discomfort with how close Jen seems to be to Jack's family and asks him to cut off contact with her.

As Jen remains firmly in the peripheries of Jack and Tasha's family life, Tasha spirals into paranoia as she comes to believe that, rather than her husband, Jen is actually after her daughter. Her worst fears are realised when Emily disappears.

Desperate to get her daughter back, Tasha will do anything to get to the truth, even if that means accepting an offer of help from an unlikely source in Jen. As they track down Jack, the reality of Tasha's marriage is finally exposed.

As Jen is faced with an uncomfortable choice, Tasha's mission to be reunited with her daughter pushes her to further extremes. When a motorway accident leaves some battling for survival, others escape to a new life, free of the past.