What are the secrets to a happy relationship? Great sex? Never arguing? Keeping peace with the in-laws? With one in three Australian marriages ending in divorce, finding the answers is more urgent than ever. During the course of this series, four ordinary couples are pushed to their emotional limits – and beyond. As long buried resentments come to the surface, and entrenched behaviours are challenged, will the couples succeed in their goal of a happier relationship, or will some decide that true happiness lies apart from one another?