Lizzie and Frances are twins, together forming part of a unit.At least that's the way Lizzie sees things. Lizzie is the twin who has everything, husband, children, a flourishing career and a beautiful house and worries about Frances who seems to lead a solitary life in London ricocheting from one disastrous man to the next. Lizzie just wants Frances to share in her own complete and satisfying life.

Then one day Frances announces she isn't coming to Lizzie's for Christmas, she's going to Spain instead. And, equally unexpectedly, Lizzie's world begins to tilt, Frances's Christmas defection seems overwhelmingly threatening to their unity.

As Frances's future begins to change into something exciting and Lizzie's deteriorates as financial pressures eat into her ideal lifestyle, could it be that Frances is the twin with everything?.