The three Kettle sisters have been accidentally starring in public performances all their lives, affecting their audiences in more ways than they'll ever know. This time, however, they give a particularly spectacular show when a raucous, champagne-soaked birthday dinner ends in a violent argument and an emergency dash to the hospital.

So who started it this time? Was it Cat: full of angry, hurt passion dating back to the 'Night of the Spaghetti'? Was it Lyn: serenely successful, at least on the outside? Or was it Gemma: quirky, dreamy and unable to keep a secret, except for the most important one of all? Whoever the culprit, their lives will have all changed dramatically before the next inevitable clash of shared genes and shared childhoods