For one long hot summer in Devon, three families are sharing one very big house in the country. The Herreras: made up of two tired parents, three grumbling children and one promiscuous dog; the Littles: he's loaded (despite two divorces and five kids), she's gorgeous, but maybe the equation for a truly happy marriage is a bit more complicated than that; and the Browns, who seem oddly jumpy around people, but especially each other. By the pool, new...