Great Big Beautiful Life by Emily Henry

When Margaret Ives, the famously reclusive heiress, invites eternal optimist Alice Scott to the balmy Little Crescent Island, Alice knows this is it: her big break. And even more rare: a chance to impress her family with a Serious Publication. The catch? Pulitzer-prize winning human thundercloud, Hayden Anderson, is sure of the same thing. The proposal? A one-month trial period to unearth the truth behind one of the most scandalous families of the 20th century, after which she'll choose who'll tell her story. The problem? Margaret is only giving each of them tantalising pieces. Pieces they can't put together because of an ironclad NDA and an inconvenient yearning pulsing between them every time they're in the same room.