It's early 2008 and the credit crunch is starting to bite. Sam and Laura Diamond - and their friends - are circling forty and all feeling a lot less certain about life than when they first met in their twenties. Laura wants to work part-time and have a third child - an appalling prospect for her husband Sam, whose secret ambition is to give up his job as a struggling scriptwriter and have a vasectomy.
Life's no more straightforward for wild child turned corporate lawyer Janey Dart. Having finally given up on Patrick, the love of her life, she finds herself unexpectedly pregnant and hastily married to a wealthy hedge fund manager who loathes her friends.
And Sam's oldest friend, trendy restaurant owner Jonathan Sleet, is about to hit the big time with a TV series and cookbook, but can't control his roving eye. So it's no surprise that back on their organic farm in Suffolk, his once glamorous wife Hannah is finding distractions of her own.
Determined to reunite the group, Jonathan brings everyone together for a holiday to celebrate his fortieth birthday. But six friends, two decades of tangled fortunes and an explosive secret from the past make for an unforgettable week.