The titular mismatched are Soraya, a good Muslim girl, and her former classmate, Magnus, a rugby god. They both just finished university (it's the UK) and are figuring out adulting--without good adult role models in their lives. Both their dads are substance abusers. Soraya's mum, despite being the breadwinner (she has a PhD in something science), supports Soraya's abusive dad...to a devastating degree, as Soraya discovers late in the novel.

Although Magnus has problems, too, he's basically a perfect YA boyfriend with an undeserved reputation as a Lothario. He does enjoy taking naked photos and posting them on Instagram, and his rugby friends are assholes, so perfect is overstating it, but he's still way better than is likely for a handsome rugby god in his early 20s.

The story is fine, predictable, frustrating. My favorite part is when the family secret comes out, and Soraya's family finally starts to heal.