Bored by her comfortable but safe marriage Kathy begins an affair, based totally on sex, with estate agent Niall ,who is also married. They agree to meet in one of the properties on his books, from which they witness a violent attack on the man next door. Kathy photographs the thugs and suggests calling the police but Niall, afraid that it will expose the affair, dissuades her. At the wedding of colleagues Emma and Jez Kathy catches Mike in a compromising position with Beth but when he tells her his marriage is on the rocks she empathizes and keeps his secret. Visiting the victim's family she learns of the criminals' motives but discovering that Niall is not worthy of her she ends the affair and confesses everything to her husband Ralph. Marianne meanwhile admits to Beth that she did have a friendship with Dave but does not know his current address.
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