Keeping up appearances in the sphere of high society, whilst tolerating mutual infidelity - provided it's kept secret - seems to be the only thing left sustaining Elizabeth's and Leonard's marriage. But when celebrating New Year's Eve in the Swiss Alps, their loveless pact is broken. On returning home from a party to their luxury chalet the accusations start to fly. This is surely the end of their relationship - unless one of them is prepared to pay a very high price...