True love at the Lonely Hearts bookshop

It's a truth universally acknowledged that a single woman in possession of a good job, four bossy sisters and a needy cat must also have want of her one true love. Or is it? Verity Love is perfectly happy on her own and her fictional boyfriend Peter is very useful for getting her out of unwanted social events. But when a case of mistaken identity forces her to introduce a perfect stranger as her boyfriend, Verity's life suddenly becomes complicated. Johnny could also use a fictional girlfriend. He persuades her to partner up for the summer, with just one promise, not to fall in love with each other ...