Dating Agency doyenne Ellie Rigby always thought that helping people find love with the hard part. But now she's all loved up with husband Nick and has hundreds of matchmaking successes under her belt, Ellie ought to know all there is to know about love. As her struggles to get pregnant put strain on her marriage, and her matchmaking service starts losing clients, Ellie realises she has so much more to learn. So setting off on a global research trip, Ellie makes it her mission to find out what makes love last forever, and whether it's enough to save her own romance.