Miles and Lucy, a posh and near-perfect couple, tell Pete and Maddie that Theo isn't his son. Their children were switched at the hospital. At first, the couples are determined to reach a mutual agreement. But soon their precarious arrangement begins to erode under the weight of perceived slights, hidden anxieties and petty jealousies. It isn't long before Miles reveals himself to be cold, commanding and aggressive. When he brings a custody case against the Rileys. That's when their damaging secrets are exposed, their relationship tested to its breaking point.
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