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.

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.