Karen McManus has done it again; the author of best-selling One of Us is Lying has another addictive showstopper with The Cousins, released in 2020. This standalone book tells the saga of an estranged wealthy family and their dark secrets, through the eyes of the youngest generation. Cousins Jonah, Aubrey, and Milly don’t really know each other, and they’ve never met their wealthy and mysterious grandmother Mildred, because she disowned their parents long before they were born, for reasons unknown. Now, she’s invited the three teens to spend the summer living and working at her resort as a chance to get to know them better – or so she says. Their parents insist they go, eager for a chance to get back in their mother’s good graces. However, once they arrive, the cousins quickly discover nothing is as it seems, as their family’s many secrets start to come to light.

As before, McManus’ characters sparkle as realistic, well-rounded individuals, and the plot is mostly relatable, though shot through with drama and glamour. Aubrey is an athlete reeling from a family betrayal, Milly is chasing a glamorous life but struggling for her mother’s approval, and Jonah is angry about his plans for summer science camp being derailed…among other things. Despite their vastly different personalities, they forge a strong bond as they team up against the summer’s mysteries and dangers. What I really liked was the interspersed chapters set in 1996 and told from Milly’s mother Allison’s perspective; these chapters tell of the events leading up to the disowning of Mildred’s children, make Allison and her brothers real and relatable, and help the main plot build to its climax in an unexpected way. It’s unclear from the ending if a sequel will be forthcoming, but personally, I wouldn’t be opposed.

If you’re looking for a thoroughly modern YA mystery with an Agatha Christie vibe, or if you’ve loved McManus’ other mysteries, or both, I definitely recommend you try reading The Cousins.