Mim Cohen roams the world in a travelling bookshop, with her dad and brother and a horse called Flossy. Flossy leads them where she will, to the place where they're needed most ... the place where the perfect book will find its way home.

Now Mim has arrived in elegant Paris where she meets Pierre, a talented but anxious artist who cannot bear to give up his paintings, even to sell them. He's miserable and poor. His customers are cross.

Mim knows they're here to help Pierre. To calm him down. To turn him into a successful artist. To make him truly happy.

If only Mim could find him the right book. If only Dad would stop getting muddled and giving everyone the wrong book.