'Mad’ Mary McArdle returns to her hometown after a short spell in prison - for something she’d rather forget. She can’t wait to meet the only person she has ever loved and had by her side while she was trying to ruin her life. That is, all the time. Her best friend, Charlene, is about to get married and Mary is 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. But her attempts at dating are a disaster and she winds up feeling more alone… until she meets Jess and everything changes.