Mad Mary McArdle (Seana Kerslake) has returned home after a short spell in prison - for something she'd rather forget. Now, everything and everyone has changed. Her best friend, Charlene (Charleigh Bailey), is about to get married and Mary is the maid of honour. When Charlene refuses Mary a 'plus one' on the grounds that she probably couldn't find a date, Mary becomes determined to prove her wrong. Her attempts at dating are a disaster and she winds up feeling more alone..until she meets Jess (Tara Lee) and everything changes.