Behind closed doors something else goes on.(English version)

Kate is just looking to have the best Christmas holidays of her life, but she doesn't have idea of what's coming.
She arrives in London, to have a nice holidays with her dad and some friends and her life's about to change, but is not the only one.
Louis, Harry, Louis, Niall and Zayn, completely strangers to each other, are going to have what they deserve.