Claire and Matt are divorced, but want to give their daughter a “normal” family Christmas and go somewhere together. Claire takes her boyfriend Patrick, a budding triathlete, with her. Matt takes with him his new love - Alex, who is funny, smart and extremely patient. Scarlett, their daughter, takes her imaginary friend Posy with her. He is a rabbit. The five of them (or six?) will diligently have fun, stir up the past and before they know it, their house will turn into a powder keg, and everything will end the same way it started - a call to the police.

But what could have happened? After all, they are responsible adults...