Cath and Si are best friends. Total opposites always together and both unlucky in love. Cath is scatty messy and emotionally closed. Si is impossibly tidy bitchy and desperate for a man of his own. They live near each other in West Hampstead close to their other best friends Josh and Lucy - who are married with a devil-spawn child called Max and a terrifying Swedish nanny Ingrid. When Portia steps back into their lives - beautiful Portia the undisputed queen of their group at university who broke their collective hearts one night and from whom they have all gradually silently grown apart - her reappearance sets off a chain of events that tests them to the limit. Does Portia have a hidden agenda or is she just looking for happy endings all round? Whatever the answers none of them could ever predict the outcome...