When Michelle, a struggling writer, falls in love with and buys a very expensive handmade mouse - a 1 only, she does not realise that the mouse has actually come to life. Michelle takes her home to live with her six children, four dogs, three horses and a house full of teddies, and that is when strange things start to happen. Whilst in the shop, Dotty has heard that she is a 1 only, but she does not know what she is a 1 only of, so sets off on a quest to find out. After having adventures with all the dogs and animals on the farm, Dotty does eventually find out what she is, but along the way she has found out something much more important.