Rose and Yann, thirty somethings, have been together for two years and now want a baby. A piece of cake ! A man and a woman, a cabbage and a rose, it's as old as the hills, that's nature ! To become three all it takes is two. Or at least, when nature cooperates... because when it doesn't, when you want to be three too hard, isn't there a risk of going from two to one? Why is it so complicated? All Rose and Yann want is just a baby.