After nine years of dating, Holly is sure Will is going to propose. Instead, he shocks her by suggesting they open their relationship and date other people. For the last three years, Fliss and Ash have been in a happily open relationship. But now they're turning thirty, he wants to close it, casting Fliss's whole approach to life into doubt. When Fliss overhears Holly crying in the toilet during her first date in nine years, they agree to teach each other everything they know about open relationships and monogamy. But perhaps they'll both learn that there's no one size fits all when it comes to relationships...
