London-set romantic comedy about the pitfalls of long-term monogamy. Martin Freeman and Mandy Moore play suburban couple Martin and Sarah Finkel, who have arrived at a hiatus in their ten-year marriage: the sex has dried up and the relationship seems to be going nowhere. Is it time to have children? Invest in an array of expensive sex toys? Or - as their best friends Peter and Janet (Jonathan Silverman and Melissa George) advise - to swing with another couple?