Glimpses of the Moon

Set in the 1920s, Glimpses of the Moon details the romantic misadventures of Nick Lansing and Susy Branch, a couple with the right connections but not much in the way of funds. They devise a shrewd bargain: they'll marry and spend a year or so sponging off their wealthy friends, honeymooning in their mansions and villas. The other part of the plan states that if either one of them meets someone who can advance them socially, they're free to dissolve the marriage.