When Elizabeth Price engages private detective Roland 'Orlando' Gibbons to find out the truth about her husband's suspected affair, she unwittingly sets off a chain of correspondence that reunites four formerly close-knit couples. They all live just a few suburban streets away from each other; they are all still married; so how – and why – did they become so estranged? In a series of letters, each protagonist is far more self-revealing than they would ever be in person. The result is an uproarious and poignant portrait of four marriages, and a story about how little we know those we think we know best.