Penny's world implodes when her ex-husband returns to town, five years after she accused him of a sex crime against her teenage daughter's friend. Nobody believed her and Penny was ostracised from her friends and family.

Penny's friends advise her to put the past behind her, but she's struggling with Phil's return. When Phil takes a teaching job, Penny tries to warn the principal about him but is dismissed.

After the death of her mother, Penny feels like an outsider in her own family and seeks solace with Simon, which pushes their relationship into dangerous territory. And a new accusation against Phil is revealed.

Grace is terrified that Phil will leave again when an anonymous accusation is revealed, and accuses Penny of being behind it. Penny takes it as proof that she was right and steps up her campaign against Phil.

Penny is stood down from her job after publicly attacking another parent. Humiliated, isolated and broken, Penny is finally visited by Ollie, who enlightens her on the effect of her actions and the truth about Phil.

Penny tries to apologise to Grace and Phil but learns they're moving to Scotland. When Ollie goes missing, she asks Tom to look for him but doesn't realise what this means for him. And Penny finally sees what was under her nose the whole time.